In this case, we mustn't see the trailers as a trailer but as works. In order to participate, trailers have to be uploaded on the filmmakers’ account as another version of the film or as film (the link doesn’t work).

TRAILERS: works should have less than 3 minutes. Trailers of all film categories will be admitted.

VIDEO CLIPS: works should have up to 5 minutes.

This is just an excerpt of the regulations, carefully read the complete regulations before submitting.