File order issue when accessing audio files via Android Document Provider (SAF) via Playbook

[rfc2822]

WebDAV: use sortOrder in queryChildDocuments

Discussed in #1425

^{Originally posted by balu- April 29, 2025}
Hi,
first of all, thank you for implementing support for sharing files via Android's Storage Access Framework (SAF) through DAVx⁵ – it generally works very well.

I’ve been trying to use this feature to play audiobooks directly from a remote location. Specifically, I’m using the PlayBook app (https://github.com/Goodwy/PlayBook) which allows adding a folder as an audiobook and plays the audio files inside it.

This setup works, but I’ve encountered a problem with the playback order of the files. The app seems to list and play the audio files in an incorrect sequence when provided by davx5. The order appears to be consistently “wrong” in the same way every time.

To isolate the issue, I copied the same set of files locally to the device and added that local folder to PlayBook – in that case, the playback order is correct. Therefore, I suspect that the issue might be related to how the Android Document Provider in DAVx⁵ serves or sorts the files.

If anyone has encountered a similar issue or has an idea for a workaround or fix, I’d appreciate any input.

Thanks in advance!