I have lots of pictures and videos stored on a NAS (that isn't backed up). I want to move the pictures and videos to my iCloud account since I pay for increased storage on that and it will have better backup rather than anything that I would ever be able to do, and just leave movies on the NAS.
What will happen on my iPhone once I do this? Will it just max out, or is there anyway for it to ignore those? Otherwise what's the point of being able to purchase more iCloud storage than your iPhone has?