Items

The Details panel's read-only Combines With lists each Combine Set recipe that uses or makes the item (Combines).

A fragment's kind is its class one step below the fragment base, so a Blueprint child of Equippable counts as Equippable. Find Fragment by Class, on an Item Definition or owned item, returns the first fragment of that class or a child, the item's own before the preset's. The Equipment Manager's Find Drawn Fragment by Class asks every drawn item.

Costly references are soft: Icon, Equippable's Item Actor Class and Anim Layer Class, Visuals meshes, Stowable's stow actor, reaches and sounds, World Item's drop animation, world item class and Impact Sound, Worn Mesh's meshes, Swing Trail's system, plus whatever the Action Graph plays. They load in the background while the item sits on the belt (server and player's machine), and on every machine while it hangs on the body, is drawn or is the Default Item. A draw that comes sooner loads what it needs on the spot (LogUPCEquipment Verbose reports it). The Drop Mesh loads when the item drops.

An item only in the inventory loads nothing ahead, so a menu showing its icon loads it itself; Collect Preload Assets returns the whole list. The Inventory Grab and Place Sounds load only on the machine of the player whose inventory holds the item. Preset, Action Graph, Ability Sets to Grant, Input Mapping Context and Guard's Defense Set load with the item.

Create a Blueprint child of UPCItemFragment with variables for your data; it joins every item's Fragments dropdown and Find Fragment by Class reads it back. Characters share the fragment, so tick Blueprint Read Only on each variable (validation warns about writable ones). State for one owned item (durability) goes on the instance as stat tags. A variable in category Hide stays out of the Details panel.

Definitions and presets are assets every machine loads; nothing on them replicates. An owned item reaches only its owning player; other machines learn what a character holds through its equipment.