iCloud Photos stuck on "Checking Library"
I'm trying to transfer photos from my photo albums on my iPhone but I see that, although all my photos have imported on my Mac, I can't see the albums I created on my iPhone. (I also see that a lot of pictures I deleted on my phone are on my mac, which is annoying, not sure how to fix that). So I go to check my settings (on Mac) and see that under "Apps on this Mac using iCloud" Photos is unchecked. When I try to check it, it just says "Checking Library" then stops and unchecks. If anyone could help me with that, it would be greatly appreciated.
MacBook Air 13″, macOS 11.2