However, in order to provide a reliable transfer the receiver needs to send an ACK message to the sender in order to progress in the file transfer, (probably for every packet received as UDP as no receive window concept or at the end of file, but this is less likely).
! from the document you have linked
>> ACK is the acknowledgement message used by the client or the server to acknowledge the receipt of the received data block
TFTP uses UDP but then implements its own messages over it to accomplish its duties.
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