View Source ExTDLib.Object.NetworkStatisticsEntryFile (ExTDLib v0.0.4)

Contains information about the total amount of data that was used to send and receive files.

NameTypeDescription
file_typeFileTypeType of the file the data is part of; pass null if the data isn't related to files.
network_typeNetworkTypeType of the network the data was sent through. Call setNetworkType to maintain the actual network type.
sent_bytesstringTotal number of bytes sent.
received_bytesstringTotal number of bytes received.

More details on telegram's documentation.