You didn't talked to NPC Arkenia, that's why you can't collect items from this mobs.
https://prnt.sc/v6gany
This item you must have, only with it you can drop items from mobs ( you getting it by talking with https://prnt.sc/v6gb4p )
NPC can be removed only with server restart ( because event NPCs have spawn points ). Today, with planned maintenance NPC was removed.
3 days of server restarts will be too much
You can upload it somewhere and put as links. But I will check if it's possible to approve them. Last time we had issue with people uploading files to us, IPB not fully secure from injections...