Raspberry Pi for Video Source

New to Raspberry Pi.
What I am doing now:
Laptop shows a slide show/video/other content. Content is either locally stored on laptop or, more often, in a browser based source like google drive. HDMI to one Cam Input on ATEM.
What I want to do:
RaspBerry Pi HDMI to ATEM. Content either on SD card in the Pi or accessed via a web browser.
I think it is as easy as HDMI from the Pi to the ATEM with the Pi configured to access the Internet and act as a direct replacement for the laptop.
Am I over thinking this?
What I am doing now:
Laptop shows a slide show/video/other content. Content is either locally stored on laptop or, more often, in a browser based source like google drive. HDMI to one Cam Input on ATEM.
What I want to do:
RaspBerry Pi HDMI to ATEM. Content either on SD card in the Pi or accessed via a web browser.
I think it is as easy as HDMI from the Pi to the ATEM with the Pi configured to access the Internet and act as a direct replacement for the laptop.
Am I over thinking this?