android - ParseObject.pinInBackground doesn't work when the object contains a ParseFile -

i'm trying fix issue past 12 hours.

i've narrowed down problem - when use following code, i'm not able pin object. when run query later, returns 0 results.

parsefile file = new parsefile("image.png", bytearray); file.saveinbackground(); chatobject.put("picture", file); 

but, when don't add parsefile chatobject, i'm able pin object , query later.

the following way i'm pinning object -

chatobject.pininbackground("unsent", new savecallback() {             @override             public void done(parseexception e) {                 if (e != null) {                     e.printstacktrace();                 }             }         }); 

i'm pretty sure code correct. knows how fix ?