How to import historical data csv to WD

How All,

I have built and programmed a home made weather station. Which saves historical as a csv file. At present I have to have my PC running non stop to feed WD.
I would like to turn of my PC and get WD to download and and use the historical data csv when I turn on my PC again. I have tried to get WD to download the csv, and plot the data on the main graphs, with out any luck.

Is there way I can do this using csv’s or do I need another file format?

Hoping some one can help

Michael