arma 2 image not working properly on arma 3

Hi

I'm trying to port my mission from arma 2 to arma 3 but the images with alpha value are not showing the same way they did on arma 2. What I get is completely transparent image when only parts of it should be transparent. I don't know what was changed that is causing this but if anyone knows good tutorial or something how to properly make images with alpha that would be great.

here's the image

the alpha is working properly even here in forums but when the image is exported with texture viewer the in game image (.paa) is almost invisible.

does anyone know whats wrong?

thanks