Trying to export humanoid into blender, but i cant make the body parts seperate

So I’m trying to make a new start up file for blender and i was doing all fine until i got to exporting and importing it on blender, I normally click on the model and exported + imported into blender and everything would be able to be selected seperately, but this time for some reason i just cant. I’ve checked for anything to untick when exporting the mesh and i saw absolutely nothing. I’m using the same methods as i used to with exporting and importing and i REALLY dont want to export each limb seperately because that would make my files all messy and i dont want that.
This is what it looks like on blender 2.8 when i import it

this is what it looks like before exporting + importing on studio

How are you exporting it?
(30 char)

by right clicking the model on studio and then clicking on “export selection”

This is how blender 2.8 works, 2.79 has the ability to select different limbs, I suggest using a rig instead, here are some tutorials

(This next one is mine)