Yes, perhaps I didn't explain well, because now I see answers about SCO-objects by Rod. That is different from a simple zipped folder like you explained. Not sure if Moodle accepts and can unzip such a simple 'package', I'm only sure that Blackboard can do that.
But the screenshots you showed in the last answer show that you created a SCO. And the imsmanifest.xml is at the root level as required.
Lilybiri