Download byte chunks from the server using a file operation id obtained via initiateFileDownload API. The bufferSize is the requested number of bytes to be received. If the size of the returned byte[] is less than the requestSize, then the transfer has completed, and the downloadID is no longer valid. An attempt to read more than the allowed maximum size will throw an exception. The caller can check the total download size in advance via getDownloadLength().
@param downloadID the file download operation id, from initiateFileDownload()
@param requestSize
@return bytes from the file.
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