Nextcloud wont preview thumbnails and load pictures on web with mobile devices

Hello dear community,

I’ve started to set up a new folder, with upload and view functions.
The folder is accessible through the generated qr-code for a friend’s wedding, to upload and view pictures from the guests.

The functions seem to work, but my problem is, that on mobile devices, pictures won’t preload the thumbnails and don’t even load the images themselves when clicked/opened the files (the loader spins and nothing happens).
The guests won’t download the nextcloud app, for this one day of use to upload wedding-pictures, so it should work properly on the web interface.

I’ve also tried to use the image preloader app “preview generator” and used the occ console, also with the php console to preload the preview images, but still it worked on desktop but doesn’t work for web on mobile devices. Am I missing any settings/options which I forgot to trigger? Is there a possible solution/work around to fix this?
I appreciate any help and thanks in advance!

The Basics

  • Nextcloud Server version (e.g., 29.x.x):
    • 31.0.2
  • PHP version (e.g, 8.3):
    • 8.3 FPM (8.3.19)
  • Is this the first time you’ve seen this error? (Yes / No):
    • yes
  • When did this problem seem to first start?
    • today after a clean install
  • Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
    • with the softwaremanager of my hoster
  • Are you using CloudfIare, mod_security, or similar? (Yes / No)
    • no

Summary of the issue you are facing:

Pictures won’t preload thumbnails and load images on mobile devices with the web version

Steps to replicate it (hint: details matter!):

  1. Install Nextcloud, delete all files/folders
  2. Upload Pictures, Generate QR-Code
  3. Scan with mobile phone

Apps

The output of occ app:list:
Enabled:

  • activity: 4.0.0
  • app_api: 5.0.2
  • bruteforcesettings: 4.0.0
  • camerarawpreviews: 0.8.6
  • circles: 31.0.0
  • cloud_federation_api: 1.14.0
  • comments: 1.21.0
  • contactsinteraction: 1.12.0
  • dashboard: 7.11.0
  • dav: 1.33.0
  • federatedfilesharing: 1.21.0
  • federation: 1.21.0
  • files: 2.3.1
  • files_accesscontrol: 2.0.0
  • files_downloadlimit: 4.0.0
  • files_pdfviewer: 4.0.0
  • files_reminders: 1.4.0
  • files_sharing: 1.23.1
  • files_trashbin: 1.21.0
  • files_versions: 1.24.0
  • firstrunwizard: 4.0.0
  • logreader: 4.0.0
  • lookup_server_connector: 1.19.0
  • nextcloud_announcements: 3.0.0
  • notifications: 4.0.0
  • oauth2: 1.19.1
  • password_policy: 3.0.0
  • photos: 4.0.0-dev.1
  • previewgenerator: 5.8.0
  • privacy: 3.0.0
  • profile: 1.0.0
  • provisioning_api: 1.21.0
  • recommendations: 4.0.0
  • related_resources: 2.0.0
  • serverinfo: 3.0.0
  • settings: 1.14.0
  • sharebymail: 1.21.0
  • support: 3.0.0
  • survey_client: 3.0.0
  • systemtags: 1.21.1
  • text: 5.0.0
  • theming: 2.6.1
  • theming_customcss: 1.18.0
  • twofactor_backupcodes: 1.20.0
  • updatenotification: 1.21.0
  • user_status: 1.11.0
  • viewer: 4.0.0
  • weather_status: 1.11.0
  • webhook_listeners: 1.2.0
  • workflowengine: 2.13.0
    Disabled:
  • admin_audit: 1.21.0
  • encryption: 2.19.0
  • files_external: 1.23.0
  • suspicious_login: 9.0.1
  • twofactor_nextcloud_notification: 5.0.0
  • twofactor_totp: 13.0.0-dev.0
  • user_ldap: 1.22.0