1- Go to this link to install : 3D Warehouse
2 - Input the link of your store > Click to install
3 - Click to Install app button
Just a minute!
4 - It has done!
1 - Go to Apps > 3D Warehouse
2 - Click to Add 3D Model
3 - Fill in Title, Choose Linked Product and upload ".usdz" file .
After You have done all:
4 - Click to Save button
5 - See the result