Audio streaming no longer possible

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Steps to reproduce

1. Navigate to an audio file such as a .wav file that is not downloaded
2. Click on the file to open

Expected behaviour

In previous versions of the app, the audio would start immediately even if a file was not downloaded.

Actual behaviour

The icon for an audio file is shown. The app then downloads the audio file in the background in its entirety and, once it‘s fully downloaded, shows the regular interface for playing audio files. For larger .wav files this usually means a long wait until the audio can be played.

On the same server the preview works regularly using the web interface, which leads me to believe that the issue is related to the app.

Logs

2026-09-09 18:42:09 [INFO] User: **** https://.com - Network response request: https://.com/index.php/core/preview?fileId=1491370&x=1024&y=1024&a=1&mode=cover&forceIcon=0&mimeFallback=0&etag=9679da81bc9200c5a2ac6842c8ce6952, result: failure(Alamofire.AFError.responseValidationFailed(reason: Alamofire.AFError.ResponseValidationFailureReason.unacceptableStatusCode(code: 404)))
2026-09-09 18:42:09 [INFO] User: **** https://.com - Network response request: https://.com/index.php/core/preview?fileId=1491370&x=1024&y=1024&a=1&mode=cover&forceIcon=0&mimeFallback=0&etag=9679da81bc9200c5a2ac6842c8ce6952, result: failure(Alamofire.AFError.responseValidationFailed(reason: Alamofire.AFError.ResponseValidationFailureReason.unacceptableStatusCode(code: 404)))
2026-09-09 18:42:11 [INFO] Inside metadata folder Perreorito with permissions: RGDNVCK
2026-09-09 18:42:16 [SUCCESS] Downloaded file: https://.com/remote.php/dav/files//****.mp3

Reasoning or why should it be implemented

This has worked before.

Environment data

iOS version: e.g. iOS 17.6.1
26.6

Nextcloud iOS app version: see More > Settings
34.1.4

Server operating system:
Linux 6.1.21-v8+ aarch64

Web server: Apache, nginx

Database:
mysql 10.11.18

PHP version:
8.3.31

Nextcloud version: see Nextcloud admin page
Nextcloud Hub 26 (33.0.8)

Start by reproducing the audio-file opening flow described in the issue and inspect the app's handling of the logged preview request and subsequent DAV download. Compare the iOS behavior with the working web preview; done means supported audio begins playback without waiting for the entire file to download.