I read through some old threads about similar problems people are having with phones, and in particular Samsung phones. I'm not sure if this one was mentioned.
I recently bought a Samsung Galaxy S23 Ultra and ran into some problems with Directory Opus and file and folder handling.
I successfully copied some music from my PC to the phone using Directory Opus and a USB cable.
The music contained some sub-folders that contained some JPG album art.
I later decided to delete the sub-folders and only keep the music, but Directory Opus couldn't completely do it. I clicked "Skip all conflicting files", and it deleted the JPG files, but left the empty folders. I tried again to delete the empty folders, but without success.
After these problems, I used File Explorer to delete the sub-folders containing JPG files without any issues. Both files and folders were deleted successfully.
PS: I have had similar problems using Directory Opus with my Canon IXUS 285 HS Digital Camera.