[demkoja]

How to back up your photos and video to the cloud using Google Drive
Launch your gallery application from your home screen or from the app drawer. We're using Google Photos in our examples.
Tap the photo you'd like to upload to Google Drive or tap and hold a photo and select multiple photos to upload.
Tap the share button. It's usually at the top of the screen. It's a right-facing 'V' with dots on each point.
Tap Save to Drive.

Tap the photos you would like to back up, tap the share button, tap Save to Drive
Tap Account to choose which Google account's Google Drive you want to save to.
Tap Folder to select the folder within that Google Drive that you'd like to save to.
Tap the folder you'd like to save to and tap Select Folder in the bottom righthand corner of your screen.
Tap Save in the bottom right-hand corner of your screen.

Tap account to select a Google account, tap Folder to select a folder, tap the folder you want to save to, tap Select folder, tap Save
Your photos will then be uploaded to that location in your Google Drive and you'll receive a notification when it's complete.

Google Drive gives you 15GB of storage for free, so depending on the size of the photos and video you're saving, you'll likely be able to save thousands of photos and hundreds of videos. The best part is you can access or download them from any device with a web browser.

[hallux]

Google Drive gives you 15GB of storage for free, so depending on the size of the photos and video you're saving, you'll likely be able to save thousands of photos and hundreds of videos. The best part is you can access or download them from any device with a web browser.

Your Google Photos library, when synced using the Photos app on your phone (SOOO much easier than you're trying to do), uses the same storage quota.