Melee weapons in BR template

Just going through the BR template tutorial, trying to add a melee weapon to the loot pool.
I got as far as to add the 'Advanced 2-handed Sword' to the loot pool, I'm able to pick it up during preview but:

  1. The attack mechanics seem to not work on equip. I'm unable to use the sword, despite having changed keybinds/etc.
  2. The melee weapons do not stack in the inventory properly.

I'm wondering if this has something to do with the inventory script not quite working out of the box?

Any help is greatly appreciated, thanks!