Several ways in
Use a password, import an OpenSSH Ed25519 or RSA key, or generate a new Ed25519 key in the app.
Read Markdown directly over SSH
Open the Markdown files already on your server without first moving them somewhere else.
The useful formats
RemoteRead is built around the things that are hard to inspect in a terminal and annoying to shuttle between devices.
Read the rendered version, switch to source when you need it, and load relative images from the same server.
Fits the server you have
Use a password, import an OpenSSH Ed25519 or RSA key, or generate a new Ed25519 key in the app.
Custom ports and starting folders work as expected. There is no RemoteRead service in the middle.
Leave credentials to an external setup such as Tailscale SSH when the server already handles authentication.
RemoteRead
That is the whole arrangement.