Cover Art - can we load it later?

Summary:

Our graphics team is working on designs for cover art - it could take some time. We are migrating our legacy course catalog using HDL - what happens if we convert legacy learning courses/records and then load cover art at a later time.

Content (required):

We would like to load legacy courses and learner records and then add in the cover art later. There does not seem to be a way to include cover art in the legacy course hdl so we are hoping the default course cover art will display. Our worry is that if we load courses/historical records first and then later add the default cover art that it will not be visible to the learner. Any experience with this?