There is usually a new Folder “Migrated+your previous catalog name”
Clicking the small triangle icon to the left expands the folder to show collections as new albums.
Are they also missing when you log-in to your Lr Web app?
Yeah that was there initially but has since disappeared along with everything else. Is there a way to 'sync' the collections back from Lightroom classic?
I tried Lr Web but I couldn't find anything.
When the problem occurred I was starting the process of migration but because I had some missing photos so I chose to cancel it to do it again later. And still the albums disappeared and I didn't get anything like “Migrated+your previous catalog name”