Version 2.7.2 has been released to the store as an open test.
The following is from the release notes
Fixed file deletion process not working properly.
Adjusted the selection state of the screen when the program is launched for the first time.
Adjusted the timing of registering files copied by wired Sync to MediaStore.
Third, after wired Sync, when the app is launched for the first time, MusicBee searches for all files and registers the copied files in the MediaStore. Otherwise, it will not be possible to delete or update them later.
I have changed the timing of that process to later than before. This will ensure that the process is done, but there will be multiple toasts at the start and end of the process.
I have not been able to keep up with multi-threading, so there is still room for adjustment, but for now I decided on this timing for certainty.