Where can you leave constructive app feedback

xfinity stream beta app, especially on firestick, is the worst streaming app I have used. You cannot even go back to your last channel. If this app has been in BETA for over a year it is a horrible PoS and once again, shows Comcast's disdain for its customers.

Not able to add Favorite channels (firestick)

No last (go back) channel

No guide available in channel. 

No Filter for HD on TCL smart TV

When you go back to the guide, active selection is not actually on the channel you are watching

There are a few more issues but those are the most glaring.