Google photos keeps crashing
I was having the same problem every time I oppended the app it crashed and I found that if i oppened it with wifi off it worked just fine so it had something to be with the automatic back up, I went to settings and allowed Backups trough cellular data and It started backing up just fine, then I turned off that option, went back to Wifi and all worked just fine, My guess is that a particular video or photo that was beeing uploades caused the crash with wifi so once it was uploaded with the cellular data the crash was no longer there, hope it helps.

I Have a Pixel 2 XL with Oreo 8.1