FWIW, here’s the error when I manually try to Move/Copy 4GB data from iOS 18.5 iSH app to Obsidian app’s path in iOS/Files app/On My iPhone/Obsidian/vault: Error: The Operation Can’t Be Completed. Couldn’t communicate with a helper application. OK.
This has succeeded 2-3 times, but now something broke. The storage is fine with 51.17 GB of 64 GB used.