JXL Support

[skjerns]

Is your feature request related to a problem? Please describe.

Currently, JPEG XL (.jxl) files cannot be displayed on the web or in the iOS app.

See also nextcloud/ios#3051

Describe the solution you'd like

Support for JXL files would be great, especially if the browser already supports displaying them anyway, why would it not display them but download them?

Describe alternatives you've considered

see also nextcloud/photos#1532

[frenzybiscuit]

Whats the status on this?

[per-oestergaard]

After reading https://tonisagrista.com/blog/2025/google-unkills-jpegxl/, I was wondering the same. Currently, my browser (Firefox or Chromium on Ubuntu) just downloads the file.