I had a problem about choosing directory before. https://www.reddit.com/r/logseq/comments/ymi6t3/comment/iv80zs3
Not sure if these steps could help
delete the app
go to Files to manually delete all related files
Update iOS to 16.1 (and reboot, obviously)
open Files, this time I could see files created by other apps in “On My Phone”
Reinstall logseq