Oh I figured out my mistake. I'm using the trial version of C4D. I can only render to 800 x 450, not 1920 x 1080. That explains it. I need to buy the software to remove that restriction.
How do I render the C4D to 1920x1080 instead of 800x450?
All I know is that the version of C4D that comes with a After Effects is only accessible from inside After Effects. It's not a stand alone application. I can't really give you any help on how to use it or how to fix your template.
I was just letting you know that you know that it's on your computer if you have After Effects.
You're going to have to figure out how to use it for your template.
I gave you the link to the help which has links to video tutorials
& a proper search on Youtube will probably return some results as well.