Add To Pile or Piling is an action performed by pressing the appropriate button when available.
Grabbing is the action of taking an item off of a stockpile.
The items to add to the pile have to be the same item. You can't stockpile different items into the same pile.
You have to be close enough to the pile of items and oriented in the correct direction to be able to add an item to a stockpile.
The stockpile cannot contain infinite items and is limited 25 items per stockpile.
Stockpiles stop changing visually in the game after adding 11 items to the stockpile, however you can still add up to 25 items to the stockpile.
Clan members can both add to and take from the stockpiles.
Some stockpiles of items can be picked up and moved with the carry action. This allows moving the stockpile as a single item instead of having to pick up and move each item individually.
Add to pile is the first step in the construction process.
Mammal Meat can only have a stockpile of ten pieces of meat.