Reply to thread

I presume that you considered other ways to put multiple images into a single file (ie, the title of this thread) such as an animated GIF, and that doesn't meet your needs, right?.

 

Obviously, an animated GIF can/will have a very different layout / aspect ratio and give a very different way to present the images to the viewer, but certainly is easy to do and may be useful for some applications

Load all files into layers in 1 step:

http://blogs.adobe.com/jkost/2012/02/open-several-photographs-into-a-single-photoshop-document.html

(Note: this could replace your 1st step in your workflow)

Make frames from layers:

http://graphicdesign.stackexchange.com/questions/3385/how-to-create-frames-from-layers-in-photoshop-extended

If the final product absolutely has to be a very tall thin image, then I have a question: Are the aspect ratios of all the individual images all the same (even though their pixel dimensions may be different)?

Tom M