RAW/ORF files opened from Files cannot be swiped to next/previous image

[vyrmaren]

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Steps to reproduce

1. Open the Nextcloud iOS app and go to Files.
2. Open a folder containing several Olympus RAW .ORF files.
3. Confirm that thumbnails for the ORF files are displayed correctly.
4. Tap one of the ORF files. The app downloads the RAW file locally.
5. Open the downloaded ORF full-screen.
6. Try to swipe left or right to move to the previous/next RAW file in the same folder.

For comparison, repeat the same steps with JPEG files in the same folder.

Expected behaviour

RAW files that can already be displayed by the viewer should behave like other image files.

After opening an ORF file full-screen, it should be possible to swipe left/right to navigate to the previous or next image in the same folder, just as with JPEG files.

Actual behaviour

The ORF file is displayed correctly after download and can be zoomed, but swiping left/right does nothing.

The RAW file appears to be treated as an individual file rather than as part of a browsable image sequence.

JPEG files in the same folder can be browsed normally by swiping.

Additional observations:

• ORF thumbnails are displayed correctly in Files.
• ORF files work correctly in Albums in the iOS app.
• Server-side previews for ORF files work correctly.
• RAW files are not shown in the Media tab.
• The server reports ORF files as MIME type image/x-dcraw.
• This may be related to issue 33.0.9.1 Raw Images broken on media tab #4126.

Logs

No relevant server errors are produced when viewing the files.

The issue appears to concern navigation/classification in the iOS viewer rather than RAW rendering itself.

Reasoning or why should it be changed/implemented?

RAW support is already partly working in the iOS app:

• thumbnails are generated and displayed,
• ORF files can be opened after download,
• zooming works,
• ORF files work correctly in Albums.

Therefore it would be consistent for RAW files that can already be displayed by the viewer to participate in normal previous/next image navigation, the same way as JPEG, HEIC and other supported image formats.

Environment data

iOS version: 27.0

Nextcloud iOS app version: 35.0.0

Server operating system: Ubuntu 26.04.1 LTS

Web server: Apache

Database: PostgreSQL

PHP version: 8.5.4

Nextcloud version: 34.0.4

Additional device/file information:

• Camera: Olympus OM-D E-M10 Mark IV
• RAW format: Olympus ORF
• MIME type: image/x-dcraw