How do you make a movie in FM4, and then how do you upload it to forzamotorsport.net ?
If im not mistaken u can do that in the replay after any race.
There u can create a movie and it will ask u to upload after that.
I’m sure a quick google search on this topic will yield a number of how-to guides on how to make a movie and then post it. Although regarding the matter of uploading it to forzamotorsport.net, that’s as simple as saving the replay/movie, and then going to “My Profile” → “My Media” → “Replays/Movies/etc” → Select the file you want to upload → Upload to Forza Motorsport marketplace.
If my memory serves me right, that’s how you do it.