This application is operated by a single individual for their own personal use. It has no other users.
The application uses Google Drive API access, granted by the account owner, to read and write files in that same owner's Google Drive.
An OAuth refresh token is stored on the owner's own private server so the connection can be re-established without repeated sign-in. File contents may be cached temporarily on that server to allow media playback.
Nothing. No data is transmitted to any third party, sold, or used for advertising or analytics.
Access can be revoked at any time at myaccount.google.com/permissions, which immediately invalidates the stored token.