Hi Conner,
You’re almost there, but you need to change a couple of things. First, you need to link the Name field instead. The FullName field contains the customer’s full name, not the contact’s name. Once you have done this, you will be able to format your ContactRecordID dropdown to display the name of the contact.
Next, you will need to setup a filter on this dropdown. We will use the FullName field for this. The filter compares the FullName of the contact, with the customer selected from the Customer dropdown. Now it will only display contacts for the selected customer.
Give this a shot and post back if you have any more questions. I hope this helps.
-Audisho