when i imported a png sequence into a video that had the sequence set at 24fps, the png sequence said 29.97fps in it's properties, so when I dragged it into the timeline it would skip some frames, eventually after releasing 5kg of Cortisol, the primary stress hormone, I figured out that by going to edit>preferences>media>indeterminate media timebase, and switching it from 29.97 to 24, I was able to fix this problem. an AMAZING idea is that from now on, all imported png sequences will have their fps set to whatever the sequence fps of the project already is.