I've seen a few posts about some of these bugs, but I'm making a post to document all of the ones I'm seeing, and a few I haven't seen posts on.
The Camera Upload switch turns off when you kill the app, so every time you open the app after it has been closed you have to go back in and turn on the camera upload, even when you have it set up automatically upload.
If you leave the app while it's backing up photos it will finish backing up the one it's currently on but won't move onto the next photo. Once you open the app up again it will start uploading the next photo.
Live Photo video clips do not get uploaded. I believe the actual bug is that it won't upload two files with the same name but different extension, since Live Photos are comprised of one JPG and one MOV file that have the same file name. Needless to say, if you are trying to backup Live Photos so you can delete them, don't. You'll lose the video portion.
Idk, if this is a software limitation, but automatic backups never triggered. I was hoping that it would eventually figure out that it's on wifi and start backing up the photos (either when the app is open in the background or the app was never started). If it's possible to make it so the app will start running in the background, even if the app hasn't been opened, and kick off an upload then that would be awesome, but it should at least do it while the app is an active background process. And yes, background app refresh is on for my device.