Lens Studio versions 2.x hiding sprite sheets?

We very often optimize our lenses that include gif animations by running the sprite sheet lens studio generates through tinypng per the instructions here https://lensstudio.snapchat.com/guides/2d/2d-optimization/. Unfortunately, after updating to Lens Studio 2.0, the sprite sheet no longer appears in the project files. We also tried using a png sequence but after running the sprite sheet through tinypng we observed no change in the total size of the lens, as though it was storing another copy of the sprite sheet elsewhere.

This issue makes it very hard for us to use 2D animations in lenses going forward. Thanks for any help with this!