Bottom Line Up Front (BLUF): Segmentation prepares a model for edits: the character, its weapons, clothing and props end up separated inside one GLB.
Point at any GLB/FBX/OBJ/STL input — your own file or a model from your account: the tool lists the named parts and saves them inside one model.
Segmentation granularity is chosen in a menu: simple, balanced or detailed; the second model version adds connectivity-based splitting.
Parts can be filled further with Mesh Completion, edited in a 3D editor, or used as the base for retopology and animation.
After completion the task shows the named parts — point to them in Mesh Completion.
Pick a coarser granularity level and try again; a failure returns the tokens.