Your files are read, never written
Leathercase opens the folder you already keep and reads it. What it adds, such as threads, comments and cards, goes into small Markdown and JSON files in a folder of its own, readable without it.
Keep writing where you write. Leathercase reads your manuscript, whether it is a folder of Markdown notes, a Word file, a Scrivener project or a Fountain screenplay, and draws the story from it. It never writes your prose.