## Problem to solve The markdown editor implemented in issues, epics, and comments as a `textarea` has functionality built in to help users write GLFM. One of these features is support for dragging and dropping a file into the `textarea` to attach it. In order to even consider the Source Editor as a suitable replacement for the `textarea`, we need to support this workflow. ## Proposal Create an extension for Source Editor that can be loaded in the context of editing GLFM files and support dragging and dropping a file into the editor. We should show a custom UI overlay when dragging a supported file over the editor (the current implementation overlays a :paperclip: icon).