There is nothing wrong with your explaining skills! There are however people who do not want things to be explained to them but instead things being done for them. Or English is not the native language but the posts look pretty ok to me in grammar, so why someone with such a grasp of the language never has heard about "chunks" is beyond me.
Also while reading a file in chunks and sending it over UDP will probably work in a local network, I'm pretty sure the resulting file on the receiver end will be damaged after being transmitted like that over a more complex network infrastructure. That is unless one adds also packet sequencing code to the transmission (and in doing so more or less reimplements the TCP protocol on top of UDP).