Hi there! Thanks for the follow up. Sorry if I wasn't clear - yes, the files gallery seems to be working perfectly. It's the embed gallery I'm having difficulty with (that's the one I'm trying to use, however).
No worries about the exclude code - easy fix.
I plan to call these galleries dynamically, which is why the embed will be so helpful. I can just pass the variable/path for the gallery I need to call, and it should work. Each gallery has an ID number, so the folders of each gallery are simply that ID. The "0" folder was just a placeholder for a general gallery of images, and for whatever reason it looks like the script doesn't like that. That's no problem either, though; I'll just give it a different name.
I did end up trying Firefox on a PC to test the embed gallery, and the layout in the embed gallery worked! I mainly use Safari on a Mac, and that's where I'm seeing the issue. Does the gallery not work well with Safari?
It will be a little difficult at the moment to get you an FTP login right away, although the files gallery is working fine so I think we're close. This is literally the entire code of the embed gallery page, so it should be super easy to troubleshoot since it's so short:
<link rel="stylesheet" href="https://firstname.lastname@example.org/css/embed.min.css">
<div class="embed" data-embed-app="index.php" data-embed-layout="columns" style="--embed-space: 8px; --embed-column-width: 230px; --embed-border-radius: 5px;"></div>
In both browsers, the thumbnails show just fine, but the full-size images have the wrong path. I'm not sure where I am supposed to put that.