Unable to import .mc(pack/world/template/addon) to Minecraft

When trying to import a custom .mcpack to use in one of my worlds I found that there was no "open in Minecraft" option and in files the .mcpack files show up as blank pages instead of pages with the Minecraft icon on them. I tried the same for a .mcworld template and the same thing happened.

This only happens on the iOS 13 public beta