How To Handle File Inputs

I am working on a tutorial website using MERN, whereon I will be displaying tutorials on pretty much anything I know well, and new things that I learn. The backend and frontend work fine. I just don’t know what to do with regards to the tutorial’s body in the submission form. The kind of tutorials that I want to add will have a combination of images, specially highlighted text(i.e. code examples), and text. So, I was thinking maybe I can upload all that as a word document and have it be parsed before it is saved in the database. Is this the way to go? Are there useful libraries that can make this easier to handle?