Check out example codes for "how to backup photos to google drive". It will help you in understanding the concepts better.

Code Example 1

On your Android phone or tablet, open the Google Photos app .
Sign in to your Google Account.
At the top, tap Menu .
Select Settings. Back up & sync.
Tap "Back up & sync" on or off. If you've run out of storage, scroll down and tap Turn off backup.

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