I'm trying to upload a big resource as three Zip files, each within the 1Gb limit. I have to use Zips rather than individual files as there are over 90 video clips in the resource. The 'Upload a resource' screen lists the files and lets me link preview images to them, but I can't get any further. There's no indication of upload progress and the Continue button is greyed out. I've tried Chrome and Safari. Any ideas? I've emailed email@example.com, no response yet.