iMac photos not syncing to iCloud

Hi I create 8000 photos on my iMac and put them on a desktop folder. I’m trying to share them with family but I cannot get the iCloud link to work. I know it’s alot of photos but I’m sure the iMac to iCloud should be syncing the photos but iCloud.com does show the folder or any of the pics. It’s been almost two days so I think the sync should have happened. Thanks!