I apologize if this topic has already been raised, but I regularly encounter the same bug in Playbeat and Loopmix. After I add the sample folders from the file manager to Playbeat and Loopmix, they become inactive after some time, so I need to remove and add them again. Problem occurs every 1-2 weeks, manual reinstallation did not help. With a small sample library this is not a dealbreaker, but with 10-15 samples folders repeating the process is getting tiresome.
P.S. I’m on iOS 16.6.1 (iPad 2021) and I haven’t moved or renamed any folders within the iOS Files app.