Each channel creates and maintains a channel app that runs on Roku' proprietary operating system and provides it to Roku. Roku just provides a platform on which the channel app can run. Roku will pass your button presses and keystrokes on to the channel app, but response is up to the app.
Anything you save to watch later on any channel is saved on that channel's servers. Retrieving it from their servers is controlled by their channel app. Problems with saved programs must be dealt with by the channel provider.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X