params: json_download_elem_param, JSON string of the download parameters
path: Storage path of the downloaded file
user_data User-defined data. The IM SDK only transfers the user data to the callback function cb without processing the data.
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params: json_download_elem_param, JSON string of the download parameters
path: Storage path of the downloaded file
user_data User-defined data. The IM SDK only transfers the user data to the callback function cb without processing the data.