@Ncwannabe
All the Roku devices with an HDMI port are "HDMI out". (Send the audio and video signal to the TV).
The same holds true for the older Roku Express+ models (3910) that contained both an HDMI port and A/V connector. (Allowed users to connect to older TVs that did not have a HDMI port.
As such, you cannot plug any device into the HDMI port of the Roku device. This port is strictly for the HDMI cable that connects the Roku device to the HDMI port of a TV.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, 4802, 4850, Premiere+ 3921, Express 4k+ 3941, Streambar 9102