I reformated the 8 gig card using the same 'allocation space' as the 4  gig (32 KB) and FAT32.  Inserted the 4 gig into the 'H' drive and copied the  contents to my C drive, then re-inserted the 8 gig and copied the file  on the C drive to the H drive.  This took about 15 min.  The 8 gig card when opened shows the same folders as the 4 gig.
I then ejected the 8 gig card, re-inserted it, and opened the ifly connect app.  It said it could't find the SD card.
Thanks for your ideas, Walter, but I'm still up the creek....