Certain operations can only be performed on IN_PROGRESS tasks. These include Update Task Data and all file upload operations. Other operations – such as Reopen Task –can only be performed on tasks that are DONE. When a client attempts to perform one of these operations on a task whose status is WAITING, the request will be rejected.

For more about WAITING, IN_PROGRESS and DONE, see Task Life Cycle,

For more about Task Upload operations, see Task Upload.

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