Importing movies not working 4.21.1

Hi, i can’t import a mp4 file to my content folder “Movies” , when i do it , it appears this, there is no play option. Anyone knows why??? Thanks!

263236-anotacion-2018-12-24-125956.jpg

263235-impot.jpg

UE4 editor don’t have a preview player, you need to implement it to your game or view it with other player