I have a Samsung Galaxy note. Been having the same issue, until now I have been periodically deleting the folder in my onedrive full of pictures. It automatically makes a new one and refills every few months.
I have the upload option turned off in onedrive settings as is mentioned in this thread several times but it was still syncing photos and videos which filled up my onedrive space fast.
Today I found theres also a setting in your phone gallery that syncs to onedrive. I've now turned that off and hopefully it will now stop.
There's a 3 dot drop down menu when in gallery>settings>top option.