In the motion design module, I seem to only find the media plate actor in the actor panel that can play media files, but the functions of this actor seem to be very limited. It can only control the playback, the start time of playback, and whether to loop. I have been looking for a long time but have not found the function of keyframe dotting for the progress of media playback. For example, I imported a 200-frame media, and I want to make an animation in the timeline to let this media play the content from the first frame to the 100th frame at a specified time. I currently can’t find a way to specify the playback of media content. As far as I know, the motion design module is also developed for the radio and television industry. The radio and television industry should use a large number of sequence frame media as the background frame of subtitles. It is reasonable that there should be no function to accurately control the progress of media playback. .