I don’t even know what to title this. haha. Custom blog php insertion?

I’m trying to create this path for each subsequent blog on my MU installation so that it links to ‘gallery.php’. The real path would be something like: wp-content/blogs.dr/1/files/gallery/gallery.php

But I would like every blog to have their own separate gallery.php file. So I put the folder ‘gallery’ and ‘gallery.php’ in each blog. On the main template I want to have something like this:

<?php include('bloginfo("url")'.'/gallery/gallery.php'); ?>

That will generate something like this:

https://www.mywebsite.com/gallery/gallery.php

For each blog. My brain is just fried today.