Using Drupal 7 - how do I get my custom thumbnails to show up?

[Meghan Southerland]

Hello - 

I'm currently using TimelineJS via the Views TimelineJS module with Drupal 7.  Everything works great (thank you!) but I wanted to create my own custom thumbnails.  I've added an image field type to the Timeline Date Content type along with adding this to the View.  I was hoping someone could provide some guidance on how to get the thumbnail to show up.  I'm able to upload a thumbnail image to a node but it doesn't show up on the timeline.