Crafting is disabled for the default items. To enable it, just change "crafting-enabled" to true for all items you want to be craftabe, then do /acreload
When you already had version 5.0.0 installed, simply remove your items.yml to let AngelChest generate the new file on next /acreload
You can now specify an amount in /acadmin giveitem <item> [player] [amount]
Reloading AngelChest will now let players automatically discover all recipes for which you enabled "auto-discover".