Hi, Sorry late reply. I think the problem is large files, so computer lags when previewing video timeline, so it jumps between shots rather than showing video. The only way to see what I've edited is to render the video. THanks
Can you provide details about the file (pixel dimensions, length of videos, effects, …) and the performance and scratch disk preferences?
Photoshop’s video capabilities are limited and if it can’t leverage your computer’s resources to your satisfaction you may want to consider working with actual video editing software (After Effects, Premiere, non-Adobe software, …).