Access to loading and unloading prop models onto any joints on the character that are marked by a PropAttachment Property. Prop files can be any model file, generally FBX, and the prop is expected to be oriented correctly to match your attachment joint for proper alignment.

Props are attached to the character skeleton and not the character rig to ensure matching behavior when the prop is attached in engine.

Joints can be marked with Prop Attachment at anytime, joints that will be used often should be saved in the settings file. However one off attachments can be added as needed.