Can a Github app hosted on Heroku add files to the GitHub repository through Heroku?

Question

So I have a Vue/Express application that uploads images using Multer to a local folder. If I host this application on Heroku using GitHub, when someone uploads an image, will GitHub create and store that image without having to redeploy or anything?

Or do I have to try to upload the images to a cloud storage and access them there? Though examples I've seen of this seem to be taking the images in local storage first anyway before then passing it from the local storage to cloud storage.