I just tried the Export option in C3 which creates a zip file, in standard download folder.
I find it a bit annoying.
Since you can't test your exports locally after you exported I always upload my exports to my host/ftp, so i can access the latest export any time, for testing.
Current workflow.
1 Export HTML5 project
2 Download export file as zip.
3. Unzip file.
4. Upload folders and files to your FTP/Host
A bit too many steps for my liking. Export to FTP/host option would be nice...
My current export flow works like this now with C2, so maybe I just got a bit comfortable.
1. Export to my local FTPBox location. (files will upload automatically to my host)