Markdown file opened in app: embedded images (relative path) fail to load ("Failed to load"), same file renders correctly in browser

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Bug description

A Markdown file with images referenced by relative path to a subfolder
(e.g. Photo 1)
opens in the iOS app (Text editor view), but every image shows the
placeholder “Laden fehlgeschlagen” / “Failed to load” plus the path.

The same file renders all images correctly in the Nextcloud web UI:

  • Desktop: Firefox on Windows 11 – OK
  • iPhone: Firefox, Startpage browser (both WebKit) – OK
  • iPhone: Nextcloud iOS app – images fail

The image files exist and are synced; they open fine in the app’s
file browser. Paths contain no spaces or special characters.
So server, Text app and iOS WebKit work; only the in-app view fails.
Possibly related to the Direct Editing session not authorizing the
image requests (assumption, not verified).

Steps to reproduce

  1. Folder X contains file.md and subfolder bilder//01.png
  2. file.md contains t
  3. Open file.md in the iOS app → image fails to load
  4. Open file.md in the web UI (any browser, incl. iOS) → image shows

Expected behaviour

Images render in the app as in the web UI.

Versions

  • Nextcloud iOS app: 35.1.0.15
  • iOS: [VERSION EINTRAGEN]
  • Device: iPhone 15 Pro Max
  • Nextcloud server: 33.0.9 (Hetzner Storage Share, managed)
  • Text app: [VERSION, falls bekannt]

iOS: 27.0.1

Same behaviour reported for the Android app (attachments only displaywhen located in the hidden .attachments. folder):

Reported for NC 27.1.6, still present in NC 33.0.9. Since browsers(desktop and iOS) render the same file correctly, this looks like alimitation of Text when embedded in the mobile apps, not of iOS itself.