The key point is that now you upload directly into the Hub. Do the following steps:
1. Backup your course: On your Moodle site, go to: Course Administration >> Backup to create a backup file (.mbz) on your site. Be sure to not include users.
2. Then go to Restore, find that backup file and click on it to download onto your desktop.
3. Drag that .mbz file into the Hub Showcase. Open the hub site on your browser and drag and drop your file into the Upload box just above this block.
4. Fill in the metadata form (information about your course).
That's all. If this does not work as expected, please contact Don (hinkel at sgu.ac.jp)