Why won't my saved snapchat photos auto backup?

[AC Question]

My gallery is automatically backed up to google+ and when I had an S3 all photos in my gallery backed up but now only photos I take directly with my phone camera will backup. How can I get my saved snapchat, instagram photos and downloads to backup again as well?

 

[B. Diddy]

Welcome to Android Central! Open the Google Photos app, swipe in from the left, and tap Device Folders. Look for the folder that has the Snapchat photos, and tap the little cloud icon associated with it so that it turns blue. It should now be auto-backing up.

 

[zac_lemieux]

What if Instagram is not an option to select as a device folder?