My Device Can't Handle Add-ons/Mods

I wanted to join someone's world, but I came across this bug. I have no way to join a world with mods/add-ons. Note that the file is 0.34MB. How can my tablet handle GIGABYTES of apps but not a tiny add-on? Note that I have low ram (around 400MB) so that might be the case. If I'm wrong, please tell me why I can't download it!