Lost reflect with alpha chahell

[Dmitriy S 1985]

hi to all
i want save channels reflect diffuse with alpha and in pp i want add backgtound
but both this channels incorrect
i saved in png format with alpha
how  can i save png without loss of quality?

[maru]

Sorry, but I don't understand what is going on here. If you just want to paste the teapot on a different background in PS, then you should save your beauty and the alpha channel of the teapot, right? Can you show your alpha channel, which you are saying is corrupted?

[Dmitriy S 1985]

All images are the inscriptions.
If I keep reflecting in alpha channels they simply disappear. That's what I show in the images. Where is it written with alpha, which means that when you save an image in PNG + Alpha was placed on a black background in Photoshop

[maru]

I think that for this material you will need to set alpha mode to "always white". This should solve the problem, unless I still do not understand it.