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Getting help
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The Basics
- Nextcloud Server version (e.g., 29.x.x):
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- Operating system and version (e.g., Ubuntu 24.04):
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- Web server and version (e.g, Apache 2.4.25):
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- Reverse proxy and version _(e.g. nginx 1.27.2)
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- PHP version (e.g, 8.3):
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- Is this the first time you’ve seen this error? (Yes / No):
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- When did this problem seem to first start?
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- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
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- Are you using CloudfIare, mod_security, or similar? (Yes / No)
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Summary of the issue you are facing:
[…]
Steps to replicate it (hint: details matter!):
Log entries
Nextcloud
Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.
PASTE HERE
Web Browser
If the problem is related to the Web interface, open your browser inspector Console and Network tabs while refreshing (reloading) and reproducing the problem. Provide any relevant output/errors here that appear.
PASTE
Web server / Reverse Proxy
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
Configuration
Nextcloud
The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oc_',
'passwordsalt' => '********************************',
'secret' => '************************************************',
'datadirectory' => '/var/www/html/data',
'dbtype' => 'pgsql',
'version' => '32.0.0.13',
'dbname' => 'nextcloud',
'dbhost' => 'db',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextcloud_user',
'dbpassword' => '********************',
'installed' => true,
'trusted_domains' =>
array (
0 => 'localhost',
1 => '192.168.1.67:8090',
2 => 'xxx.xxxx.freeddns.org',
),
'overwrite.cli.url' => 'https://xxx.xxxx.freeddns.org',
'overwritehost' => 'xxx.xxxx.freeddns.org',
'overwriteprotocol' => 'https',
'trusted_proxies' => ['172.17.0.1'],
'enable_previews' => true,
'enabled_preview_providers' =>
array (
0 => 'OC\\Preview\\PNG',
1 => 'OC\\Preview\\JPEG',
2 => 'OC\\Preview\\GIF',
3 => 'OC\\Preview\\HEIC',
4 => 'OC\\Preview\\BMP',
5 => 'OC\\Preview\\XBitmap',
6 => 'OC\\Preview\\Movie',
7 => 'OC\\Preview\\PDF',
8 => 'OC\\Preview\\MP3',
9 => 'OC\\Preview\\TXT',
10 => 'OC\\Preview\\MarkDown',
11 => 'OC\\Preview\\SVG',
),
// Mówimy Nextcloudowi, żeby zignorował Imagicka
'disabled_preview_providers' => ['OC\\Preview\\Imagick'],
);
Hello everyone,
I am new here but very surprised that i didn’t dive into nextcloud sooner! I am creating small 3 persons setup to fast interchange svg projects for laser cutting and more.
But I’m struggling with a persistent issue on a fresh Nextcloud installation and I’ve run out of ideas after two days of troubleshooting.
My setup:
Raspberry Pi 4, Docker & Portainer, Nextcloud Image: nextcloud:apache
Database: postgres:15-alpine
All data is on the host filesystem at /home/user/nextcloud via volumes.
My problem
Previews for standard images like PNG and JPG generate perfectly and instantly.
Thumbnails for SVG files are never created. I only see the default mime-type icon in the web browser.
Here is a summary of everything I have tried so far, without success:
Configuring config.php:
I have added OC\Preview\SVG to the enabled_preview_providers array.
I have verified with php occ config:system:get enabled_preview_providers` that the server sees this configuration correctly.
I have entered the container (as root) and successfully installed librsvg2-bin and imagemagick.
I have confirmed they are installed using which rsvg-convert. The tools are present.
I can manually generate a perfect preview when I am inside the container as the www-data user. The command rsvg-convert -h 256 /path/to/my/file.svg works generating without any errors. I installed the preview generator app to get access to its commands.
When I run php occ preview:generate-all -vvv, the command runs very quickly. The output shows it processes JPG/PNG files but completely skips all SVG files without printing any error. It doesn’t even try to process them. The standard php occ files:scan --all also does not trigger SVG preview generation. I confirmed that the imagick PHP module is active.
I checked the /etc/ImageMagick-7/policy.xml file, and there is no policy blocking SVG.
As a test, I added ‘disabled_preview_providers’ => [‘OC\Preview\Imagick’] to config.php to force the system to use rsvg-convert. This did not change the behavior.
As another test, I added preview_mimetypes_blacklist => to `config.php. This also did not change the behavior.
As a final test, I even tried to force the mapping with ‘preview_provider_mimetypes’ => [‘OC\Preview\SVG’ => ‘image/svg+xml’]. This also did not help.
I thought that my browser is blocking them but i have downloaded all previews zipped and checked them for any svg thumbnails - NONE 
At this point, it feels like I’ve exhausted every possible configuration issue.
Is this a known bug in the latest nextcloud apache image or this version of Nextcloud? Is there any deeper level of debugging I can enable to see why the decision to skip SVG files is being made?
Thank you for any help you can provide.
I did attempt to install the AIO version, but it conflicts with my existing setup on this Raspberry Pi. I reached a point in the AIO setup instructions where it became clear that it would not work well with my existing Nginx Proxy Manager setup. This became a major roadblock and a source of frustration, so I decided to return to the standard Docker setup that I want to have full control over.
