how do you clip an image with another?

I’m using slider as a progress bar but what I want is to clip the foreground image, not resize it, which slider does.
6161920--673825--upload_2020-8-2_21-18-25.png
how do I do that?

solution:
6161944--673831--upload_2020-8-2_21-37-26.png
fg anchor upper left corner
6161944--673834--upload_2020-8-2_21-37-35.png
slider control clip
6161944--673837--upload_2020-8-2_21-37-46.png
clip has mask with show graphic off
6161944--673840--upload_2020-8-2_21-37-57.png

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