Good morning, afternoon, or evening. I have a question in regards to Dynamic Link—specifically,

 Good morning, afternoon, evening. I have a question in regards to Dynamic Link. I'm a small YouTuber focusing primarily on gaming. When recording my videos, I record in 3840x1080, so that when editing, I can make my template 1920x1080 and duplicate the file and use one for my face cam and the other as my screen recording via cropping. This works well, until it's time to add effects in After Effects via Dynamic Link. When After Effects imports my video, the part that I cropped out reappears. Could anyone give me any insight as to why this is happening. Thank you in advance!