Problem loading textured characters into mixamo

While I can see the Iron Man character I downloaded from sketfab textured correctly in blender, I cannot upload it to Mixamo in a textured manner. I tried copying with fbx and it didn't work, I tried zip and it didn't work. Can anyone help, thank you

character link I downloaded this blender zip  : 

https://sketchfab.com/3d-models/iron-man-1a21e1b8f2844956a30d28838d5f816a