Animate position of an illustration in a locked mask?

Question

Hey guys,

I´ve an Illustrator layer I imported as composition into After Effects - all fine.

I´ve added a mask to the layer and now I want to animate the position of this layer but it should only be shown the area within the mask without moving the mask.

Shortly: The mask should be locked but the illustration not.

Simply like in Photoshop when you delete the staple between layer and mask.

I tried using a solid layer with a mask and alpha mask to get a clipping mask for the layer underneath, but unfortunately it didn´t work. Same with a shape layer.

The blue boxes layer should only be shown in the area of the mask (solid) over it

Thank you for your help!

I have After Effects v.22.0

Mylenium · Accepted Answer

Track Mattes will work just fine. You just have the order wrong. The matte goes above the layer to be masked, not beneath it. For multiple layers pre-compose them or create the mask on top of the comp and use the Stencil Alpha blending mode.

Mylenium

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