As Luminate has a course size limitation of 2.5 gigabytes (GB), you will want to ensure that your eCentennial course export is 1.7 GBs (the export file is zipped, meaning the size of the export will be larger when uploaded and expanded in Luminate) or smaller before it is migrated. If a course exceeds this size limitation, it will unfortunately not be able to be migrated to Learn Ultra. Instructions for remediating large files - notably video and audio files - are included in the migration preparation materials available on this site.