No. When you add or remove videos in your Vimeo Showcases or Channels (or your feed), your content updates automatically.
Tappla syncs with Vimeo / your feed every 24–48 hours.
Your native Fire TV app pulls the latest videos, titles, descriptions, and categories each time it starts.
So once your source is updated, your Fire TV app shows the changes, with no manual refresh needed.
When you can't wait for the automatic sync
Posting breaking news or a service you want on TV right away? Open Playlists in your dashboard and hit Sync Videos. That pulls from your source immediately instead of waiting for the next automatic sync, and the video appears the next time the app starts. The button can be used once an hour.