Tweak ReactJS Frontend

I need to make a small tweak to the ReactJS frontend of Seahub. Does anyone know how I can go about doing this? Just need to add aspect ratio prop to videojs component.

I have added the code to the component I am trying to edit in:

seafile-server-latest > seahub > frontend > src > shared-file-view-video.js

But the tweaks do not seem to be applied to the actual frontend. Am I missing a step to have them actually apply to the Reactjs frontend?