Sync Photos iCloud Library to second apple id
I had found an earlier post here about connecting a second Apple ID to my Photos Library. It said to have your Photos Library on an external disk (check), set up my iMac with the second Apple ID (my wife's - check), log in with the second Apple ID and then set up the Photos app to use the Photos Library on the external HD (check).
But since it was being done on the same iMac, the Photos Library was already there (over 85K of photos) and it is still "Restoring from iCloud" after about 48 hours. And on her iPhone and iPad (both of which I changed the Apple ID from mine to hers), the Photos app is saying "Updated" but they are showing only around 13K of the entire 85K library (again after about the same 48 hours).
Is this the way it should happen and we just have to be patient? Because in the interim I believe I have to leave her Apple ID logged into my iMac all the time for the updating/restoring to work. Which also means I cannot access the Photos library from my log in.
Need opinions of whether or not I am doing this correctly and just have to be very patient with the process. Thanks.
iMac 24″, macOS 12.2