With Catalina, you have to give applications the ability to access various drives that they may wish/need to work with.
Go into your System Preferences and select the Security and Privacy tool. On the left hand side scroll down to the Files And Folders section. Before you do anything you will need to unlock the lock on the bottom left corner by clicking on it and then giving your system password. Scroll down on the right hand side until you see Adobe Bridge. If any of the options shown below are not checked, check them.
While you are in this window, make sure that the Full Disk Access also has Bridge selected for having your permission to do what it needs to do.
Also be aware that there are a few camera cards that do seem to be giving Adobe some problems, sorry but I can't remember which ones they are at this time.