Alpha input not accessible in “get value” or “set value” puzzles

Hello,

I need to

1) be able to manipulate the transparency (alpha) value with the “get value” and “set value” puzzles, but also
2) be able to download a 3D glTF file that brings along the attributes of the Blender Materials (color, texture, etc).

I’m able to successfully do one or the other. I accomplish #1 by using a Value node on the Alpha input and then accessing that value in the get/set value puzzles. This only works when I have the “glTF 2.0 compatible” checkbox UNchecked. Problem is, when I use the download 3D glTF file functionality in my app, it shows up in Windows 3D Viewer as all white (none of my colors, textures, etc).

Checking the “glTF 2.0 compatible” box on each of my materials allows goal #2 to work, but it also appears to take away the ability to manipulate the Alpha value for the material.

Any suggestions?