Just how much access does Google have to my device, exactly?

Pixel 8a.

I understand that stuff synced to google cloud storage like photos and drive are 100% accessible to google, but given that this is a Google device, can they, for instance, reach into my internal storage and access any files/photos/audio/video that I have on there?

access audio can cloud cloud storage device drive files google google cloud instance internal photos pixel privacy storage understand video