I uploaded a Resource Pack to MediaFire, I pasted the link in the right place in Aternos.
When I join my server I get a message about the pack so I click on yes to download it but nothing happens after that. No loading bar, no messages and the resource pack doesn't load.
It's the 'Default 3D' resource pack and it works fine in single player.
I uploaded it as it is (.zip file with assets folder in it).