Create

 { 
 // Union field origin 
can be only one of the following: 
 "new" 
 : 
 { 
 object (  New 
 
) 
 } 
 , 
 "upload" 
 : 
 { 
 object (  Upload 
 
) 
 } 
 , 
 "copy" 
 : 
 { 
 object (  Copy 
 
) 
 } 
 // End of list of possible types for union field origin 
. 
 }