I have a Mac Pro with 80 GB from of main HD memory, using compressed files stored on an external Thunderbolt2 drive.  Why do I have errors uploading, exceeding memory?  My Pro Zenfolio account has no limits on file quantity, not uploading any RAW files, all compressed file to 200K each.  Each folder I have selected has 1200-1500 images.  Never had this issue before?