Support
Visual MD should be simple: drop a folder onto the window, choose a document from the shelf, and read.
If a folder will not open
Allow file access when macOS asks. If the folder was moved, renamed, or its permission was revoked, remove it from the shelf and add it again.
If a document looks incomplete
Confirm that the file ends in .md, .markdown, .mdown, or .mkd. Remote images also need an internet connection and must still be available from their original host.
If you still need help
Open an issue on GitHub. Include your macOS version, what you expected, and what happened. Please do not attach private documents unless they are necessary to reproduce the problem.