Catalina - PT and Read Only Drive

[audiobob]

Installed Catalina, 10.15.3, from scratch on a 2018 Mac Mini with PT 2020.3. Importing files (audio and movies) from some drives is fine while other drives just show the drive icon and no contents. While in PT and in the import files dialog, I attempt to create a new folder within the drive, I get a "Location is read only" dialog. Looks like it's a permissions issue but all seems normal within the system and drives in PT Workspace are set to record.

Have a mix of APFS and Mac OS Extended drives but can import from both formatted drives...but not from others. Weird. Ideas appreciated.

EDIT: So Pro Tools cannot create a new session on the drive...says I don't have permission. But I can add files to the drive from the Finder and drag and drop files from the drive into PT.

SOLVED. Dragging and dropping audio from the drive from Finder into a Pro Tools session mysteriously makes the drive visible from Pro Tools import audio dialog box. Weird.