macOS10.15/11.0: I can't open Clip format files
If you have updated Clip Studio Paint to version 1.10.0 or later and can no longer open .clip files only, please change your macOS Security and Privacy settings.
Procedure
1. If Clip Studio Paint is already launched, exit the program.
2. Open System Preferences from the Apple menu in the upper left corner of the screen.
3. Select Security & Privacy.
4. Select Files & Folders from the menu on the left.
5. Check all the items under CLIP STUDIO PAINT.
Note:
If you get the following message when saving a file in Clip Studio Paint, press [OK].
If you click [Don't allow], you will not be able to open .clip files stored in that location. Please follow the steps on this page to set the access permission.