This was a jira in the past...and still now many more years in it is still needed. The default attachment point of right hand is still not assigned by many creators to a more obvious location, some that are so new that they may not even be aware they could do otherwise, leaving it up to the end user to reassign. If there was a checkbox or drop down available in the upload window, then this would give the creator the opportunity to just select the attachment point that better works with the product.
We still see people losing an upper object when trying to wear a lower object because not all people use add and not everyone assumes that they will be to the same point.
I made a mock up and there is enough room for something of this nature in the upload window as it is currently.