'Unable to load video" error message ever since IOS 14 update

Before IOS14 i could use itunes to sync videos from my laptop to my iphone and it worked fine. Now since i did the ISO14 update most of the videos say "Unable to load video" "an error occurred while loading a higher quality version of this video". i have 10 videos and over half of them say it, they are all MP4s and only 1min long. I even tried my old videos that i know worked before the IOS14 update and most of them say the same thing as well. How do it fix this? What can i do?