Amazfit Watch faces

Hey,
I wanted to edit this watchface https://amazfitwatchfaces.com/gtr/view/18593 via Sasha's editor, but it has only background listed in elements, after packing it back it shows black background and nothing else.
How can I unpack it manually or something? I'd like to possibly change calories to heart rate and add some shortcuts for weather, steps etc.

The watchface you mentioned does not use the script format specified by sasha's editor, so you cannot use sasha's editor to unpack it properly. I think in this case after unpacking, you should only get the normal PNG.

If you want to make further modifications, you have to add custom script by yourself.
Add and edit the index.js file.

I see, I was thinking to just add corresponding images and icons simply via Sasha's editor, but it would take me some time, that's why I asked here.
What's about smooth seconds? I can't get it to work properly in Sasha's editor, I tried all of methods, best working for my GTR3 was method 2, but on one watchface it made watch so laggy, like pulling notification panel or quick settings panel