When using the WebDAV connection in AIMP, no files appear to be missing. However, in this app, the file loss is quite severe — which makes it unusable on my phone with limited storage.
Initially, only around 1600 files were synced. On the second attempt, the number increased to 1867, but subsequent syncs always stop at 1867. The structure of the library in WebDAV is identical to the local one, and the folder depth does not exceed five levels.
Note: I really like this app! If this issue can be resolved, I’d be happy to purchase and use it on my old phone.