So from what I understood, if I have Apple Photos on my Mac set up with iCloud it will upload Photos to iCloud and only store a representation locally, thus free local disk space.
I have now importet a bunch of folders and my disk only has 112 MB of free space, so I'd assume there is enough "storage pressure" for deleting local copies but I cannot see any upload status nor does it appear that Photos wants to reduce local disk space.
Edit:
It appears Photos stopped uploading for lack of local disk space, which will be the primary reason why it cannot upload and it cannot free local disk space.
How can I fix this?