Alright I finally solved this issue by simply putting all of the videos in the content → Movies folder.
this documentation helped me a lot 
and thanks for everyone who tried to help! Play a Video File | Unreal Engine 4.27 Documentation
Alright I finally solved this issue by simply putting all of the videos in the content → Movies folder.
this documentation helped me a lot and thanks for everyone who tried to help! Play a Video File | Unreal Engine 4.27 Documentation