Ownership matters
Ground items can be private, timed or public. Aleges checks whether an item was spawned for your account before allowing collection. Seeing an item does not mean that every account may pick it up.
Ironman restrictions
The ground-item handler prevents iron accounts from collecting items dropped by or for other players when the mode's ownership rules do not permit it. Group and encounter rules may add their own checks.
Inventory and looting bags
You need suitable capacity to receive loot. Some pickups can interact with the looting bag, and the game reports when bag or inventory space prevents collection. A second looting bag is also restricted.
Activity restrictions
Ground-item pickup is restricted during duels and while signed up for a tournament. Read the on-screen message when a pickup is rejected.
Do not use the floor as storage
Different spawn paths have different reveal and despawn behaviour. This guide intentionally does not promise a universal timer for dropped items. Use supported storage and check the action before dropping or destroying an item.