What access does Storage Studio ask for on my Google Drive?
Short answer: Read and write access to your Drive, which it needs to copy, move, sync and back up files and show them in Finder. Google lists what's granted before you agree, and you can revoke it at any time.
Access to read and write files in your Drive, which it needs to copy, move, sync and back up files there and to show your Drive in Finder. Google lists exactly what's being granted on its approval page before you agree.
Storage Studio only acts on your Drive when you ask it to — a transfer, a backup, a scan you start, or a file you open in Finder. It doesn't send your files or Drive contents to Storage Studio's servers. You can withdraw the permission any time by removing the account and revoking access in your Google account settings.