# \#preview **URL:** https://help.nextcloud.com/tag/preview/155.md [Latest](https://help.nextcloud.com/latest.md) · [Categories](https://help.nextcloud.com/categories.md) · [Tags](https://help.nextcloud.com/tags.md) --- ## [Hardware based thumbnail generation (nvidia)](https://help.nextcloud.com/t/hardware-based-thumbnail-generation-nvidia/133337)
**Author:** [@shoaib42](https://help.nextcloud.com/u/shoaib42)\ **Replies:** 6\ **Last updated:** [September 23, 2026, 12:08am UTC](https://help.nextcloud.com/t/hardware-based-thumbnail-generation-nvidia/133337 "2026-09-23T00:08:46Z")
Hey! I’v been using nexcloud close to a year on my tiny Nvidia Jetson Nano. Been ok so far. The reason for my post is the about the preview generator. My question is how would I go about doing the following. Not gener… --- ## [Appdata/preview folder?](https://help.nextcloud.com/t/appdata-preview-folder/248022)
**Author:** [@vincen](https://help.nextcloud.com/u/vincen)\ **Replies:** 2\ **Last updated:** [August 13, 2026, 8:59am UTC](https://help.nextcloud.com/t/appdata-preview-folder/248022 "2026-08-13T08:59:07Z")
Hi What is stored in the subfolder appdata/preview in data directory ? Considering the name of it I suspect it stores preview of images stored in NC ? If so is it ok to delete whole content of it ? I have quite few ins… --- ## [Files keeps loading on web portal](https://help.nextcloud.com/t/files-keeps-loading-on-web-portal/240865)
**Author:** [@lostdriver](https://help.nextcloud.com/u/lostdriver)\ **Replies:** 3\ **Last updated:** [February 26, 2026, 4:00pm UTC](https://help.nextcloud.com/t/files-keeps-loading-on-web-portal/240865 "2026-02-26T16:00:08Z")
▶ Support intro Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can. :heart: The Basics Nextcloud Server version (e.g., 29.x.x): 33.0.0-1… --- ## [Preview not updated after replacing PDF content via putContent()](https://help.nextcloud.com/t/preview-not-updated-after-replacing-pdf-content-via-putcontent/240877)
**Author:** [@jro-signotec](https://help.nextcloud.com/u/jro-signotec)\ **Replies:** 0\ **Last updated:** [February 24, 2026, 9:39am UTC](https://help.nextcloud.com/t/preview-not-updated-after-replacing-pdf-content-via-putcontent/240877 "2026-02-24T09:39:30Z")
Hi everyone, I am currently implementing a webhook-based integration that stores signed PDF documents in Nextcloud. The integration replaces the content of an existing file after it has been signed. I am using the foll… --- ## [ClientException Client error: \`POST https://xxxx.xxxx.xxx/apps/richdocumentscode/proxy.php?req=/cool/convert-to/png\` resulted in a \`403 (Forbidden)\` response](https://help.nextcloud.com/t/clientexception-client-error-post-https-xxxx-xxxx-xxx-apps-richdocumentscode-proxy-php-req-cool-convert-to-png-resulted-in-a-403-forbidden-response/240407)
**Author:** [@jschmied](https://help.nextcloud.com/u/jschmied)\ **Replies:** 1\ **Last updated:** [February 16, 2026, 5:10pm UTC](https://help.nextcloud.com/t/clientexception-client-error-post-https-xxxx-xxxx-xxx-apps-richdocumentscode-proxy-php-req-cool-convert-to-png-resulted-in-a-403-forbidden-response/240407 "2026-02-16T17:10:29Z")
▶ Support intro ich habe etliche dieser Fehlermeldung im Log. Reboot habe ich schon probiert. Leider bin ich neu auf Nextcloud und sehe keinen Ansatzpunkt um den Fehler zu beheben. The Basics Nextcloud Server version … --- ## [Differnece between appdata-\*/preview and preview-\*](https://help.nextcloud.com/t/differnece-between-appdata-preview-and-preview/235000)
**Author:** [@t.kuge](https://help.nextcloud.com/u/t.kuge)\ **Replies:** 3\ **Last updated:** [November 20, 2025, 6:57pm UTC](https://help.nextcloud.com/t/differnece-between-appdata-preview-and-preview/235000 "2025-11-20T18:57:15Z")
▶ Support intro Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can. :heart: The Basics Nextcloud Server version (e.g., 29.x.x): 32.0.1.2 … --- ## [Cannot see previews of my photos in the web browser](https://help.nextcloud.com/t/cannot-see-previews-of-my-photos-in-the-web-browser/164575)
**Author:** [@meyou1](https://help.nextcloud.com/u/meyou1)\ **Replies:** 27\ **Last updated:** [October 7, 2025, 8:24am UTC](https://help.nextcloud.com/t/cannot-see-previews-of-my-photos-in-the-web-browser/164575 "2025-10-07T08:24:25Z")
Hello, I have Nextcloud 27 installed from docker, on my Linux VM. The Photos app installed is the default one that comes with the installation, specifically at version 2.3.0. I have a bunch of photos that I took on my … --- ## [Thumbnails work for RAW images, but clicking starts a download instead of expanding the preview?](https://help.nextcloud.com/t/thumbnails-work-for-raw-images-but-clicking-starts-a-download-instead-of-expanding-the-preview/192169)
**Author:** [@Adrian\_Rettich](https://help.nextcloud.com/u/Adrian_Rettich)\ **Replies:** 10\ **Last updated:** [September 18, 2025, 7:53am UTC](https://help.nextcloud.com/t/thumbnails-work-for-raw-images-but-clicking-starts-a-download-instead-of-expanding-the-preview/192169 "2025-09-18T07:53:59Z")
I have a lot of raw images in my cloud (e.g. .arw and .rw2). imagemagick clearly generates previews for them, since I can see the thumbnails in the Nextcloud web interface. However, when I click a jpeg or similar file, a… --- ## [RAW thumbnails/previews missing on hosted Nextcloud (Aruba Drive Advanced)](https://help.nextcloud.com/t/raw-thumbnails-previews-missing-on-hosted-nextcloud-aruba-drive-advanced/231694)
**Author:** [@Paolo85](https://help.nextcloud.com/u/Paolo85)\ **Replies:** 2\ **Last updated:** [September 9, 2025, 5:36pm UTC](https://help.nextcloud.com/t/raw-thumbnails-previews-missing-on-hosted-nextcloud-aruba-drive-advanced/231694 "2025-09-09T17:36:02Z")
Hi everyone, I’m a home user on a hosted Nextcloud provided by Aruba (Aruba Drive Advanced service). On the web UI I can’t see thumbnails or lightbox previews for RAW files (NEF/ARW/CR3/DNG). Files appear in the list, b… --- ## [Thumbnail not working, but it seems they did on initial run](https://help.nextcloud.com/t/thumbnail-not-working-but-it-seems-they-did-on-initial-run/229858)
**Author:** [@OverrRyde](https://help.nextcloud.com/u/OverrRyde)\ **Replies:** 6\ **Last updated:** [August 6, 2025, 5:38pm UTC](https://help.nextcloud.com/t/thumbnail-not-working-but-it-seems-they-did-on-initial-run/229858 "2025-08-06T17:38:06Z")
Hi everyone! thanks in advance for any support you can provide! Having issues with displaying thumbnails in Photos/Memories and can’t for the life of me figure it out. I’ve tried several things but nothing seems to work… --- ## [Unable to generate preview ( File not found even though file is found)](https://help.nextcloud.com/t/unable-to-generate-preview-file-not-found-even-though-file-is-found/229553)
**Author:** [@pbaj](https://help.nextcloud.com/u/pbaj)\ **Replies:** 4\ **Last updated:** [July 31, 2025, 10:18pm UTC](https://help.nextcloud.com/t/unable-to-generate-preview-file-not-found-even-though-file-is-found/229553 "2025-07-31T22:18:05Z")
I am facing this issue where I am trying to generate a preview of a pdf file however for some reason it says File not found which is odd because the file is present The preview system was working fine like 4months ago. … --- ## [Video thumbnails not generated or showing](https://help.nextcloud.com/t/video-thumbnails-not-generated-or-showing/196295)
**Author:** [@Ethnique](https://help.nextcloud.com/u/Ethnique)\ **Replies:** 6\ **Last updated:** [July 16, 2025, 6:51pm UTC](https://help.nextcloud.com/t/video-thumbnails-not-generated-or-showing/196295 "2025-07-16T18:51:50Z")
Nextcloud version (eg, 29.0.5): 27.1.3 Operating system and version (eg, Ubuntu 29.04): Ubuntu 20.04.4 LTS Apache or nginx version (eg, Apache 2.4.25): nginx/1.18.0 PHP version (eg, 8.3): 8.1 The issue you are facin… --- ## [No preview for mp4 file](https://help.nextcloud.com/t/no-preview-for-mp4-file/227163)
**Author:** [@Ryuzaki](https://help.nextcloud.com/u/Ryuzaki)\ **Replies:** 2\ **Last updated:** [June 19, 2025, 2:16pm UTC](https://help.nextcloud.com/t/no-preview-for-mp4-file/227163 "2025-06-19T14:16:34Z")
Hello, I installed NextCloud Web Server on a Synology NAS, I can’t get previews for video files. I installed ffmepg7, installed the preview plugin, specified the path to ffmepg in NextCloud’s config.php, and run th… --- ## [HEIC/DNG Previews will not display no matter what I try (Linux/Apache)](https://help.nextcloud.com/t/heic-dng-previews-will-not-display-no-matter-what-i-try-linux-apache/222727)
**Author:** [@junior466](https://help.nextcloud.com/u/junior466)\ **Replies:** 7\ **Last updated:** [May 28, 2025, 3:34pm UTC](https://help.nextcloud.com/t/heic-dng-previews-will-not-display-no-matter-what-i-try-linux-apache/222727 "2025-05-28T15:34:15Z")
I have spent weeks researching this issue and no solution anywhere has resolved it. Hopefully this will serve as a main support thread for all users experiencing this issue. For the life of me I can’t get HEIC or DNG im… --- ## [Preview der Bilder NAS](https://help.nextcloud.com/t/preview-der-bilder-nas/222082)
**Author:** [@CoreX76](https://help.nextcloud.com/u/CoreX76)\ **Replies:** 1\ **Last updated:** [April 7, 2025, 8:09pm UTC](https://help.nextcloud.com/t/preview-der-bilder-nas/222082 "2025-04-07T20:09:43Z")
Hallo zusammen, ich habe ein Problem mit Preview der Bilder in der Rubrik Fotos/All Media, die auf meiner NAS (ResPi5/OMV) liegen. Hier werden nur Quadrate ohne Inhalt angezeigt. Hochgeladene Bilder über Nextcloud hing… --- ## [Can’t figure out HEIC previews](https://help.nextcloud.com/t/can-t-figure-out-heic-previews/220504)
**Author:** [@fire\_alarms](https://help.nextcloud.com/u/fire_alarms)\ **Replies:** 6\ **Last updated:** [March 20, 2025, 10:57am UTC](https://help.nextcloud.com/t/can-t-figure-out-heic-previews/220504 "2025-03-20T10:57:25Z")
Can’t figure out how to get HEIC previews to work. Does any know how to and if not is there workarounds such as automatically converting HEIC to PNGs for all users? Thanks in advance for the help! (Running on Docker co… --- ## [Flut an Fehlermeldungen "Failed to convert Preview"](https://help.nextcloud.com/t/flut-an-fehlermeldungen-failed-to-convert-preview/219710)
**Author:** [@jB-SH](https://help.nextcloud.com/u/jB-SH)\ **Replies:** 5\ **Last updated:** [March 13, 2025, 9:33am UTC](https://help.nextcloud.com/t/flut-an-fehlermeldungen-failed-to-convert-preview/219710 "2025-03-13T09:33:41Z")
Hallo zusammen, auf meiner Nextcloud wird das Log mit Fehlermeldungen geflutet, mit denen ich nicht wirklich etwas anfangen kann. Die Installationsbasis: netCup Shared Webhosting (Webhosting 4000) Nextcloud Hub 9 (30… --- ## [Problem with video preview in Nextcloud when sharing a link](https://help.nextcloud.com/t/problem-with-video-preview-in-nextcloud-when-sharing-a-link/217995)
**Author:** [@Jakondo09](https://help.nextcloud.com/u/Jakondo09)\ **Replies:** 0\ **Last updated:** [February 20, 2025, 7:53pm UTC](https://help.nextcloud.com/t/problem-with-video-preview-in-nextcloud-when-sharing-a-link/217995 "2025-02-20T19:53:43Z")
\[details=“Problem with video preview in Nextcloud when sharing a link”\] How to fix the issue with video viewing when sharing a link? Currently, it only offers to download the file. The Basics Nextcloud Server version (… --- ## [Can't create previews for JPEGs](https://help.nextcloud.com/t/cant-create-previews-for-jpegs/213000)
**Author:** [@segmentationfault](https://help.nextcloud.com/u/segmentationfault)\ **Replies:** 1\ **Last updated:** [February 1, 2025, 11:50pm UTC](https://help.nextcloud.com/t/cant-create-previews-for-jpegs/213000 "2025-02-01T23:50:24Z")
Nextcloud Server version (e.g., 29.x.x): 30.0.4 Operating system and version (e.g., Ubuntu 24.04): Debian GNU/Linux 11 (bullseye) aarch64 Web server and version (e.g, Apache 2.4.25): Apache/2.4.63-dev (Unix) Re… --- ## [Collabora preview generation errors and files not loading](https://help.nextcloud.com/t/collabora-preview-generation-errors-and-files-not-loading/211476)
**Author:** [@Grom](https://help.nextcloud.com/u/Grom)\ **Replies:** 12\ **Last updated:** [January 20, 2025, 9:23am UTC](https://help.nextcloud.com/t/collabora-preview-generation-errors-and-files-not-loading/211476 "2025-01-20T09:23:15Z")
The Basics Nextcloud Server version: 30.0.2 Operating system and version: Docker 4.36.0 on Windows 10 PHP version: 8.3.13 Is this the first time you’ve seen this error?: Yes When did this problem seem to first start?: I… --- ## [When is a preview not a preview (Breaking user expectations)](https://help.nextcloud.com/t/when-is-a-preview-not-a-preview-breaking-user-expectations/183199)
**Author:** [@spyro](https://help.nextcloud.com/u/spyro)\ **Replies:** 27\ **Last updated:** [December 30, 2024, 8:14pm UTC](https://help.nextcloud.com/t/when-is-a-preview-not-a-preview-breaking-user-expectations/183199 "2024-12-30T20:14:24Z")
So last night I found that the preview generation had got a bit out of hand, with them filling my entire disk (it’s not a huge disk at present) of my test box. So, doing the logical thing that I think any normal person … --- ## [How to Enable Previews for Sony \*.heif Files in Nextcloud with Imaginary? (Apple \*.heic is working)](https://help.nextcloud.com/t/how-to-enable-previews-for-sony-heif-files-in-nextcloud-with-imaginary-apple-heic-is-working/213171)
**Author:** [@user\_thorsten](https://help.nextcloud.com/u/user_thorsten)\ **Replies:** 8\ **Last updated:** [December 28, 2024, 10:13am UTC](https://help.nextcloud.com/t/how-to-enable-previews-for-sony-heif-files-in-nextcloud-with-imaginary-apple-heic-is-working/213171 "2024-12-28T10:13:02Z")
Hi everyone, Does anyone know how to get photo previews for \*.heif files created with a Sony camera? I’m using a Sony a6700, and here’s an example image for reference: Download Example Image. (available for 30d) My Set… --- ## [No preview generator available for any file type](https://help.nextcloud.com/t/no-preview-generator-available-for-any-file-type/210779)
**Author:** [@odecif](https://help.nextcloud.com/u/odecif)\ **Replies:** 10\ **Last updated:** [December 3, 2024, 3:20pm UTC](https://help.nextcloud.com/t/no-preview-generator-available-for-any-file-type/210779 "2024-12-03T15:20:22Z")
The Basics Nextcloud Server version (e.g., 29.x.x): Nextcloud Hub 30.0.2 Operating system and version (e.g., Ubuntu 24.04): Fedora 41 Web server and version (e.g, Apache 2.4.25): Apache/2.4.62 PHP version (e.g,… --- ## [No preview generator available for file of typeimage/jpeg](https://help.nextcloud.com/t/no-preview-generator-available-for-file-of-typeimage-jpeg/210603)
**Author:** [@roxi](https://help.nextcloud.com/u/roxi)\ **Replies:** 4\ **Last updated:** [November 24, 2024, 7:34pm UTC](https://help.nextcloud.com/t/no-preview-generator-available-for-file-of-typeimage-jpeg/210603 "2024-11-24T19:34:30Z")
The Basics Nextcloud Server version (e.g., 29.x.x): 28.0.12 Operating system and version (e.g., Ubuntu 24.04): x86\_64 GNU/Linux - Service Provider is STRATO on a shared enviroment Web server and version (e.g, Apac… --- ## [When I am in nextcloud talk, pictures in chats are not previewed](https://help.nextcloud.com/t/when-i-am-in-nextcloud-talk-pictures-in-chats-are-not-previewed/208450)
**Author:** [@Amirali\_Zolfaghari](https://help.nextcloud.com/u/Amirali_Zolfaghari)\ **Replies:** 0\ **Last updated:** [November 1, 2024, 2:26pm UTC](https://help.nextcloud.com/t/when-i-am-in-nextcloud-talk-pictures-in-chats-are-not-previewed/208450 "2024-11-01T14:26:40Z")
when I open my chats, I can’t see what the image is before oppening it and I must open an image to see the content. however this wasn’t the same in the past. is there anyone who can help me? I have used ios, windows an… --- ## [HEIC/MOV previews](https://help.nextcloud.com/t/heic-mov-previews/62973)
**Author:** [@Dridhas](https://help.nextcloud.com/u/Dridhas)\ **Replies:** 28\ **Last updated:** [March 13, 2024, 11:23am UTC](https://help.nextcloud.com/t/heic-mov-previews/62973 "2024-03-13T11:23:04Z")
Hello All, i recently cleared the cache on my Nextcloud iOS app and realized that the previews are not being regenerated because they are HEIC pics or MOV videos. The previews will only come on only when accessing the … --- ## [Where preview jpeg\_quality is stored?](https://help.nextcloud.com/t/where-preview-jpeg-quality-is-stored/204036)
**Author:** [@adrch](https://help.nextcloud.com/u/adrch)\ **Replies:** 1\ **Last updated:** [September 15, 2024, 7:03pm UTC](https://help.nextcloud.com/t/where-preview-jpeg-quality-is-stored/204036 "2024-09-15T19:03:51Z")
I run this: occ config:app:set preview jpeg\_quality --value="90" where is stored this option? I checked config.php, is not there --- ## [Issue with Nextcloud Preview](https://help.nextcloud.com/t/issue-with-nextcloud-preview/203772)
**Author:** [@devnull](https://help.nextcloud.com/u/devnull)\ **Replies:** 4\ **Last updated:** [September 13, 2024, 5:40pm UTC](https://help.nextcloud.com/t/issue-with-nextcloud-preview/203772 "2024-09-13T17:40:14Z")
I spent a little time with Nextcloud Preview today. More with previews in general. The app Previewgenerator works ok. On one of my Nextclouds I have about 750 MB of images and a preview folder of 1000 MB. I think that’… --- ## [Ffmpeg und Provider](https://help.nextcloud.com/t/ffmpeg-und-provider/203304)
**Author:** [@ddoomm2626](https://help.nextcloud.com/u/ddoomm2626)\ **Replies:** 6\ **Last updated:** [September 9, 2024, 2:58pm UTC](https://help.nextcloud.com/t/ffmpeg-und-provider/203304 "2024-09-09T14:58:21Z")
Kennt hier einer einen günstigen Nextcloud Hoster, der auch ffmpeg für die Video Thumbnails unterstützt? IONOS, Hosting.de, Hetzner und viele weitere große Anbieter unterstützen es leider nicht. Man kann es auch nicht üb… --- ## [Preview generation brings server to a halt (extreme CPU and RAM usage) \[Docker\]](https://help.nextcloud.com/t/preview-generation-brings-server-to-a-halt-extreme-cpu-and-ram-usage-docker/146065)
**Author:** [@laxis96](https://help.nextcloud.com/u/laxis96)\ **Replies:** 7\ **Last updated:** [August 18, 2024, 10:55pm UTC](https://help.nextcloud.com/t/preview-generation-brings-server-to-a-halt-extreme-cpu-and-ram-usage-docker/146065 "2024-08-18T22:55:49Z")
Nextcloud version: official docker nextcloud:apache image (24.0.5) Operating system and version: Docker 20.10.17 on Debian 11 Apache or nginx version: the one included in the official image PHP version: the one inclu… [Next page](https://help.nextcloud.com/tag/preview/155.md?match_all_tags=true&page=1&tags%5B%5D=preview)