Saves a part of a large file (over 10Mb in size) to be later passed to one of the methods.
boolFalse#bc799737 = Bool; boolTrue#997275b5 = Bool; ---functions--- upload.saveBigFilePart#de7b673d file_id:long file_part:int file_total_parts:int bytes:bytes = Bool;
|file_id||long||Random file id, created by the client|
|file_part||int||Part sequence number|
|file_total_parts||int||Total number of parts|
|bytes||bytes||Binary data, part contents|