Sent File Request - Other party gets error message that I do not have enough space.

I sent a file request.  The receiver has a 1.6 GB file to send to me.  When he drags the file onto my link, he gets a message that (my name) is low on space, and cannot upload the file.  According to my account, my 2 TB account has 1.9 TB available.  I certainly have plenty of space.  Any idea why this is happening?

Thanks!