Different iCloud on mac and iPhone
I don't know or understand much about iCloud so this might be a simple question.
For some reason, I have logged into a different iCloud on my macbook than on my iPhone. On my macbook I'm logged into my own iCloud account but on my iPhone I am logged into my brother's iCloud account. Now this is problematic as I can't put my iPhone photos on my macbook so the storage of my iPhone is full right now. Now I was wondering if, when I log out of my brother's account on my iPhone and log into my own, I will loose all the photo's or will they automatically be transferred from his account to my own?
Hope someone can help me!
iPhone 8, iOS 12