Does UPP load an alpha channel stored in raster images such like TIF or BMP? Is anything special need to be done to do this? Because I have tried to load an image with an alpha but it doesn't seems to work (image was not displayed as transparent).
I am sorry. It was a way how an image have to be saved from Photoshop what needs to be corrected.
(I just tried to save an alpha channel but it does not work. Then I have deleted a background layer and saved just one non-bg-layer where transparent pixels ware erased. Sorry again.)