Are you not able to upload files via Use-your-Drive? Please check if the Upload Folder that you selected in your shortcode isn't a Virtual folder. The virtual folders are the root Google folder, the Shared with me folder, the Shared Drives folder and the Computers folder. Those folders be used to upload files to. You can ofcourse select any folder inside a virtual folder as upload location
So to fix this issue, just select any folder except the virtual folders mentioned above.
If this doesn't help you, please create a support ticket and provide your purchase code and a temporarily WP admin login so we can safely debug the issue for you?.