Very confused about storage - especially ES File Explorer

[silvercue]

I have installed ES File explorer and a Skydrive browser.  I have been able to play films from my skydrive, but am confused as to whether they streamed or downloaded.  I also accessed them through ES File explorer.

If I go to Data usage is shows that ES File Explorer is using 2.6GB (skydrive browser only 290 mb).  However, my app section says I have no downloads and if I go to the storage section it says Apps are only using 2 gb and think that is mainly maps for a satnav App I have.

Is data usage not related to storage at all?  If not - what does the 2.6gb in ES file explorer mean?

Thanks

[chaikenj]

Is data usage not related to storage at all? 

Data usage is not storage.  It is the amount transmitted over WiFi.  I guess this is to help people whose Internet service has monthly limits on the amount of upload and download.