Maybe you guys have covered this already.  I haven't been reading 
this thread because it just says ARRL antenna handbook in the 
subject line.  Anyway, I usually send multiple files to DropBox 
in a zipped folder to the public folder in DropBox, then email 
the recipient when the folder is uploaded.  You can use the 
context key when you're in DropBox with the zipped folder 
highlighted, go down to copy public link I think it says,  and 
hit enter.  Then go back to the email and paste in the link.  
When the recipient opens the email, they can click on the link or 
use the context key then arrow down to save target as, where you 
can write down where to have the zipped folder go.  That's about 
it.  Jim WA6EKS