Bro has an Air 2S. Uses an LG Velvet phone with a V30 SanDisk Micro SD card. Shoots in 4K, uses the DJI app to edit and it renders/converts it down to 1080p. He'll post on YouTube or Insta and it just looks jittery. But straight upload a 4K video file without editing to YouTube and it looks great.

Any ideas?

Hello there vice350z. I am sorry for the trouble this has caused and thank you for reaching out. Kindly please post a shorty sample video showing the issue for us to be able to see and can assist you? Thank you.