can't get a converted mov to open

I am on toon boom 20 premium. I want to put a gif into toon boom so I converted it into a mov and an mp4. I can’t get toonboom to open it I go to import then movie then i hit the mov and mp4, it loads for less than a second and disappears then nothing happens. what’s going on?

how to post on ? Let me know

Hi. I’m having the same issue.
My projects using rotoscoping are now completelly stopped because of this.
Did you manage to get import movie to work? Thank you!