UploadFile

Uploads the PlatformFile carried in incomingData to url with method, headers and contentType, reporting progress as it goes — pair it with OpenFilePicker or GetFile using their platform-file output. A JSON response is parsed into plain maps, lists and primitives (a JSON body that fails to parse yields null); anything else is passed through as raw bytes. incomingData is required and must be a PlatformFile. Dispatches onStart after incomingData is validated, before the upload begins; onUploadProgress repeatedly while uploading (carrying the progress); onNetworkResponse(status)/onNetworkFailure(status) (carrying the parsed body) when a child event is wired to that exact HTTP status — the former for successful statuses, the latter for the rest; onSuccess (carrying the parsed body) when the upload succeeded and no status-specific event was declared; onFailure when incomingData isn't a PlatformFile (fired before onStart, no data), when the response is unsuccessful with no status-specific event declared (carrying the parsed body), or when the upload itself fails (carrying the Throwable) — all logged.

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