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Hi all, I have a large file to upload server. This process requires 3 steps. The first is to inform the server about the file ( #of chunks size, name etc.., Type: DataTask) The second step starts according to the server response (contains next step data). (Type: FirstOperation) In the second step, each file chunk is transmitted to the server. In the last step, Client send a request to informed that the transfer has been completed (Type: ChunkOperation) in the third steps, service dosent work. I can see in the log file that last operation method called, but no response available. (LastOperation) There is no problem while the application is in the foreground.. FirstOperation.txt ChunkOperation.txt LastOperation.txt uploadManager.txt