When I try this, I get the advanced menu and the everything but when I press enter with your first example to launch an iso of mine it just goes straight to HDD. The same when I try to return or escape out of the menu.
I see the /var/www/html/iso folder isn’t on ubuntu by default so I assume you created it, the imgfetch url you have doesn’t include the html part though. Does it know this by default?
Can you maybe post a list of the content in your iso folder? I’ve read something about memdisk earlier on, I think I’m missing it and maybe that’s why I get this kind of behaviour. I’m new to this so If somebody could point of the obvious steps that are needed to get this working it would be nice.