hedgedoc/docs/content/media/filesystem.md

Filesystem

You can use your local filesystem to handle your image uploads in HedgeDoc.

You just add the following lines to your configuration:
(with the appropriate substitution for <DIRECTORY> of course)

HD_MEDIA_BACKEND="filesystem"
HD_MEDIA_BACKEND_FILESYSTEM_UPLOAD_PATH="<DIRECTORY>"

Please make sure that the user that runs HedgeDoc is able to write to the uploads directory.