Before Migration you have to drag them into Collections (and thus make them) as per detailed here:
I haven‘t seen any advice on how to fix this once Migration has been done.
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I assume Migration completed? If so.....
After asking about Victoria suggested...
In Classic (with Sync on), create Collections from your Folders (see link above) and enable sync on each Collection.
This should then sync those Collections to the to the Cloud (as Albums) and re-populate them with your photos.
Note that any Folder hierarchy won’t sync though, and will have to be re-created.
Give one or two a go first and let us know how it goes!
Thank you so much. We had a ringworm ourbreak at the shelter so spent yesterday disinfecting everything and didn’t get a chance to try. I will get on later today and see if I can get it to work. Thank you so much for your help.
Sorry to hear that!
I wanted to give you some extra information/advice Sarah after discussing with others.
When Sync is turned on after a Migration, everything should relink okay. There have been some instances though where virtual copies have been created and this seems to be due to a change of GPS data on those photos.
It is issues like this why Adobe don’t recommend using Classic and CC together I guess and why this ‘fix’ isn‘t documented.
Just wanted you to know that turning back on could cause other problems but you may take that gamble as opposed to organising 50,000 Photos!