You might add or remove videos to your showcases/channels on Vimeo.
Your Tappla MRSS feed will automatically be updated every 6-24 hours.
What does that mean for your Fire TV app?
Fire TV dynamically updates your videos, titles, descriptions, and navigation bar sections/categories each time the app starts.
So as long as your MRSS feed is updated, you should see also the updates in your Fire TV app - no need to manually refresh your Fire TV app by yourself.
Tappla syncs with Vimeo / your feed every 6-24 hours.