Error "The operation can't be completed" when adding files to Creative Cloud storage using Finder shortcut
When you try to add files to the Creative Cloud file storage by dragging them onto the Creative Cloud folder shortcut in the Favorites section of Finder, you receive an error "The operation can't be completed."
After relaunching Finder, the issue no longer occurs. Adobe apologizes for any inconvenience in relation to the error. Our engineering group is aware of the issue, and plans to address it in a future update.
If you continue to face difficulties uploading files, consider using an alternate method such as opening and placing them directly in the Creative Cloud Files folder.