If it is an online course, the course description must show that this course is aimed at PhD students, experienced researchers or similar. Either upload the course description or the part describing this.
If it is a Cousera course, you upload the course description since courses in the Cousera platform is preapproved.
If it is an external course from another Danish university (it usually appears from the course description), you upload the course description.
If it is an external course from a foreign university, you need to contact the course leader for documentation of the academic level if it is not clear from the course description.