Thanks for sharing the experience you have with this concern, @Davenlr.
Please be guided that changes made to the Roku OS should not affect the channels or apps, as these were all maintained by the channel provider themselves on the Roku platform. However, may we know the current OS of your device? Also, have you already performed a channel reboot, as this may be an issue with the app itself? To do this, you can follow our standard troubleshooting steps below:
Remove the channel: Highlight the channel tile on your home screen and press the Star button to open the options menu. Select the Remove channel and confirm.
Restart your Roku device. Restart the device from the settings menu. Go to Settings > System > Power (skip if the option is unavailable) > System Restart.
Re-install the channel: After your Roku device restarts, visit the Roku Channel Store and add the channel again.
We also suggest checking for an app update by highlighting the channel tile, pressing the * button, and selecting update. Please let us know what you find out after doing so. All the best, Janadee
Thanks. Turns out it is Amazon and not Roku. While HDR worked on Shield Pro, and LG, and Sony TV internal apps, it did not work on Roku, Samsung, TCL, or even FireTV4KMax. Have contacted Amazon but do not expect much from them.