Google Drive & External Apps
Disable Drive & external apps
Users can select files from Google Drive and external apps automatically unless you disable them using "DisableOptions_Enum". Here's how you can do this.
Once you disable these apps, they won't be shown to users.

Google Drive Events
Once a user selects files from Drive they're downloaded. with following Events(Download Started/ Download Succeed/ Download Failed), you can make custom notifications

Cache Folder
The download and document section in file picker drawer files cant be accessed normally so a copy has to be made then you can access that copied files for further usage.

*Delete Files: used to delete the downloaded or copied files from the internal storage
*GetAllCopiedDocumentFilesPath & GetAllCopiedDownloadFilesPath: the path of the files copied from document and download section could be used to delete some files or knowing what you have in the storage
*GetAllDownloadedGoogleDriveFilesPath: allows you to reuse what you have already downloaded from Drive instead of downloading it again