I was having the same problems, last update was Oct 15, 2018.
I did change settings on my phone under Display&Brightness switching AutoLock to “Never”
and it worked.-- or so I thought
at least to the point of updating the upload/backup to yesterday, no photos from last night to this morning…
I took a picture of this computer screen just now and it does not auto back up immediately.
–so I then chose a manual backup from my camera roll
- opened the app and pulled down on the picture upload screen and you will see a cloud appear at the top and start working - presumably to start backing up the most recent photos? nope did not work
but by looking at the PHOTO NAME - it appears there are many missing photos that did not upload, for example the photo names
OCCUR AS FOLLOWS –
IMG_5983.PNG then the next one uploaded to the backup is IMG_5986.PNG
so clearly there are Pictures in between that did not upload, and that I have confirmed by looking at the actual iPhoto app. they are there, but not uploaded
last night I did 5 consecutive screen captures - there is only one that uploaded.to the MyCloud
also Iphoto app shows 6089 photos and that numbering system stops at 5986 ?
so many not uploaded and that 5986 pictures naming on MyCloud app is not accurate either as there are many missing in between.
so the numbering system counts all the pictures but does not upload all of them.
This makes the backup system UNRELIABLE - and it should be addressed.
also the newer file extension .HEIC is cannot be displayed with the My Cloud app… this needs to be addressed.
I have an iPhone 7
I do hope they monitor this thread and address these problems