I would make the channels pure black/white - select each Image # channel and then use Image > Apply Image using Linear Burn blend mode. I haven't tested if this is an issue or not, however, this is the only way that I have made or would think of making alpha channels for such a task.
Then Invert the channel as the expectation is to have a black alpha with a white "window" designating the layer content area.
Revised template is attached.
JJMack's original instructions:
The package includes four simple rules to follow when making Photo Collage Template PSD files so they will be compatible with my Photoshop scripts:
- Size the photo collage templates for the print size you want - width, height and print DPI resolution.
- Photo collage templates must have a Photoshop background layer. The contents of this layer can be anything.
- Photo collage templates must have alpha channels named "Image 1", "Image 2", ... "Image n".
- Photo collage templates layers above the background layers must provide transparent areas to let the images that will be placed below them show through.
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