Pre load text into editor

Is it possible to pre-load text into the markdown editor with javascript?

I want the user to upload a markdown file, and then insert the contents of the markdown file to the editor so the user can edit his file contents.

Start by locating the JavaScript markdown editor entry point and checking how its current content is set; the issue names no file or test. Confirm the change by loading an uploaded Markdown file into the editor and allowing the user to edit its contents.

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