iCloud photos gone from albums and all photos?
Today I looked into my iCloud Photos albums to try and find a photo - only to discover there were only a few photos left in each album, and they had also disappeared from the 'All Photos' section. I haven't changed any settings recently, as far as I am aware, they've just gone. I've attached a Screenshot to show the issue. It is around 500 photos lost, maybe a few more or a few less, but I don't have any other copies of them due to my Mac not wanting to upload anything - since fixed without doing anything.
Previously that album had more than 100 photos in it, all gone but four? If anyone knows how to fix or restore then please help as these photos were very important to me, particularly from this album.
Jack
Mac mini (Late 2014), OS X Yosemite (10.10.5)