Hey there, I have an HTC M9 running Android version 6.0, and Sprint is my carrier. My phone stopped backing up my photos to Google about 2 months ago. It was working for for almost a year until then. I try to make it backup and it says "Upload Started" and then "Backing up 1 of xxxx" and then never moves, just stays stuck at 1. I've done a lot of looking around and haven't found a solution that works yet (obviously). I tried clearing the cache from Google Play Services, Google+ and Google Photos, and uninstalling/reinstalling Google+. I know I have more than enough free space on google. I'm connected to wifi. No wifi connections are marked as a hotspots... I just don't know what to do at this point! Also please don't just guess at things for me to try. If you just "think" it works, I don't want to experiment because I don't want to risk losing the last couple months worth photos! But if you or someone you know has actually had this problem and fixed it, any advice would be greatly appreciated! Thanks so much!