What I did is I first checked what sprite did what by editing sprites in colour pattern and random scribbling on top, then looked at the app while comparing with the pattern. Then numbered things to confirm my theory (small buttons, long buttons, etc.) I studied what icons are used in the atlas, and what aren’t (unecessary slider, red bullet box, and something else in top right), where do they appear on the app and so on.

Seems like a lot of things, but it’s like simplistic memory puzzle where everything is already revealed.

Once the entire learning process was done I layered elements down on groups. Like group buttons, colour picker group, blue buttons, checkboxes and so on. Most time consuming process. Once this was done, proceed to editing…

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Maybe I should try sending you separate layers of the template file as pngs? Since I think you can’t open the tiff or psd on mobile-