you can't upload a xml file only import,
but you can't wear a xml file, you must make this rigged first
depence what viewer you used to make this rigged
if you used:
Hydrastorm then you must use Mesh Helper to make it rigged
Darkstorm then you must use MeshesSL to make it rigged
it must be worn on your body or other body to export it to as xml file
if you rezzed it on the ground, then it will be always unrigged and dont work
but you can't wear a xml file, you must make this rigged first
depence what viewer you used to make this rigged
if you used:
Hydrastorm then you must use Mesh Helper to make it rigged
Darkstorm then you must use MeshesSL to make it rigged
it must be worn on your body or other body to export it to as xml file
if you rezzed it on the ground, then it will be always unrigged and dont work