Force Mac to backup photos to iCloud
I know this seems a bit stupid. I think it was because I was a bit impatient. My upload speed is 0.71Mb/s (that means it will take 3 hours 43 minutes to upload!). It has only uploaded 170MB/1.1GB. I have however had my computer asleep for a few hours though.

Even though I have posted this I would still like to know how to force upload incase I need to in the future.