S4S wont recognize transparent mesh

Hi. This is not how it is supposed to be done.
- open an original unedited package;
- export the diffuse texture;
- open it in photopea, edit the opacity of the layer,File - Export - PNG;
- import this image in s4s.

That is all, no moving uvs or textures, no simglass shader, all of that is done in a different situation differently