I just applied a Movie Style like "Old Movie" or "Travel" to my video, but I did not see any changes in preview and produced video. What's wrong?

To apply Movie Style effect to movie files, the file length should as a general rule be longer than 3 minutes. If you apply a Movie Style to a movie that is shorter than 3 minutes the style may not be applied.

If you have applied it successful to a short file in the past, then please know it may work with some styles and not others, because of the different encoding mechanism.