Behaviour packs that are added in the automatically added 'behaviour_packs' folder won't appear in Minecraft PE

I have behaviour packs that contains 'entities' and 'loot_tables' folder. I placed the behaviour packs in the 'behaviour_packs' folder that is automatically added in games>com.mojang and when I go into Minecraft PE, none of my behaviour packs appeared in the selection slot.

Android Version: 5.0.1

Device: ASUS Zenpad 7.0 (P01V)

Minecraft PE version: 0.15.90.8 (0.16.0 build 5)