Hi Annet,
Thanks for the file. Much easier. If you like to see what the plug in does, make a copy of it and while it is selected (copy) press the c key. It will not work anymore, but you can see how it is built and how the textures are applied. This is more to show that each page can have only one Texture Tag. With that, the option to apply two Texture Tags per page is gone.
I have set up a new file, based on yours. Please have a look here:
https://www.amazon.com/clouddrive/share/DcdIGQKQwC8zNN6Nf9mld6JokUchYYDv8C95dpMHwh9
The Color Channel>Layers works pretty much like a Photoshop File, the layer transparency is here the “Layer Mask”.
Please note, if you have an image already in that channel, just click on that little triangle to add a Layer Shader, the image will be inside of it.
Let me know if there is anything not clear. BTW, I do not have animated the Gradient (Layer Mask) in the Material, but that is of course possible.
I’m happy to look in anything that you would like to explore, if there is anything that stops you otherwise.
My best wishes for the project
(Thanks to nitro4d.com to allow the testing of that plug in)