My brother invited me to team, I join, I can't see his map edits. (blank map for me)

Hello my brother and I are working on creating a map. He did all of the starting work on pc and then invited me to join. I accepted the invite and he made me publisher. However when I open uefn and click on the project we both have access to it is just a blank island. I think the problem is that its stored in my one drive which I have disabled. Whenever the map loads it says “Your project is backed with OneDrive which may cause conflicts”. Can anyone help? Thanks.

Maybe this will help,
Try copying your map directory to somewhere else on your PC out of onedrive,
Maybe change the Directory name on your onedrive so it is not pointed at anymore by UEFN.

Open UEFN editor (use a blank map) and Select Edit, then Editor Preferences.
Then in the Unreal Editor For Fornite - Settings Section (usually first thing you see on opening), you’ll see a Project Folders, hit the + icon, then click on the dots, and select the new folder with your project in it.
Do the File New/Open Project.

Hopefully that works.