Vegas Pro 18.0
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RX 6700xt
Searched subreddit & google

Hi, I'm trying to reveal more and more of an image gradually. I hoped this'd work through masking with keyframes, just like when using position keyframes, the image moves gradually from keyframe to keyframe, but with masking it changes in one step. Also, in the end I would like to move the bottom part into the positive mask and move the top out, but when I change to position and keep the mask the same, it just shows the area that's makes moving, instead of the mask staying stable and the bottom part of the image moving in. How would I make these things happen? Thanks in advance!