From Google:
If your storage plan is canceled or expires
Google Drive
You can’t sync or upload new files. You can’t create new files in Google Docs, Sheets, Slides, Drawings, Forms, and Jamboard. Until you reduce the amount of storage you use, neither you nor anyone else can edit or copy your affected files. Syncs stop between your computer's Google Drive folder and My Drive.
Important: As of June 1, 2021, if you remain inactive or go over your storage quota for 2 years or longer, all of your emails may be deleted.
Google Photos
You can’t back up any photos or videos. If you want to add any more photos and videos, you can free up Google storage space or buy more Google storage.
汁:
https://support.google.com/drive/answer/2736362?hl=en