How do I Insert Specular Map in Normal Map's Alpha Channel

[HYDROTRANSFORMATOR]

And also one non-topic question.

How do I insert Specular map in Normal Map's alpha channel(Affinity PHOTO)? I found some page about it

but everything looks super hard just for editing channels... I failed on doing first steps. It was super easy to do it in Photoshop(I think, you know why I do not use it anymore ). My target is importing texture in Source Engine with "phong"(specular) variation, included in alpha-channel of normal map(that how it works there).

I ask this question, because this page (link that I pasted) is from May 2023, so may be something has changed since one year?

Edited July 28, 2024 by HYDROTRANSFORMATOR