[aidenn0]

I would suspect that if you reconfigure your SDCard to be internal storage then it will work again. This is a limit of Android permissions that happened a couple of major versions ago (I use a different tool for file transfer and I remember when it stopped being able to transfer files to external storage).

[rcMgD2BwE72F]

I suggest to use https://f-droid.org/en/packages/com.github.catfriend1.syncth... and setup the synced folder on the SD Card as a subdirectory of the app data folder. It's worked well with an old phone (until I replace it with one that no SD card but 128+ GB of storage)