Please allow me to repeat the essence of a post that occurred in this thread a couple of months ago. This is how it is "supposed" to work...
- When the dialog appears that requests you to select the file, click SELECT.
- The file should now be visible in the Finder dialog that opens.
- Select it.
- Click Grant Access.
- That should solve the problem for that file, and any file in the same folder.
The dialog is poorly labelled: it means "Select the entry shown above in this dialog, then click "Select"".
Just a note: This is not a "bug". This is how Apple's sandboxing mechanism works. Each application installed from the Apple Store starts with permission to access only three folders. Apple requires the User to grant permission for the application to
access any other locations.
Once the user does grand permission, that location and its permission is stored within the application settings for that user.
So you should be asked only once for any location. But you will be asked for each location that is outside the standard set.
(Edited to correct my error in steps 1 - 3)
Hope this helps