I have been using jw player for years in self-hosted mode, and am trying to setup a url video in the dashboard for the first time.
I have the url video and poster image working OK, but despite having uploaded a captions track, i cannot get the captions to display, or for the player to show the "CC" button.
Showing source on the page that contains the embed code shows nothing in the tracks  section - despite me having added the vtt file to the tracks in the dashboard.
I know my vtt file is fine because i use it on a self-hosted site.
What am I missing?