@ninjameow312 Unfortunately you need a mod to do it, hence not possible on XB1.
To Upload:
1. Load the household manager from Map View (icon in the upper right corner called household manager)
2. Find the family the Sim is in (hopefully it's not a hidden Sim ... if so, see below)
3. Load the family in CAS from the household manager and upload
4. If the Sim is in a hidden household, you basically need to be fast. Invite the Sim over and as soon has he remotely appears, pause the game. Then enter testingcheats true in the cheat console (make sure to do this on a backup of your save so you don't loose achievements on the save). Then shift-click on the Sim and choose modify in CAS. Upload from there.