Dave,
When you create the course and set the course format to Single Activity, there is a second drop-box where you specify the type of activity - the default might be Forum. Be certain SCORM is selected. If the SCORM .zip file has not been uploaded the SCORM activity edit page should open when you open the course.
I suspect you might have created a course with a default single activity that is something other than SCORM - that has happened to me. You will need to enter the course edit page. If you cannot find the course edit menu, you can always go directly to https://<your_moodle_url>/course/edit.php?id=<the_course_id_number>
Floyd