WinSCP itself can browse any drive (C:, D:, F:, etc.).
But when you connect to your own PC using SFTP,
the server on Windows exposes only what it considers the “root,”
and by default that root is mapped to C:. Other drives don’t appear automatically.

This behavior is documented:
Windows’ built‑in OpenSSH SFTP server redirects the root folder to C:,
and does not list other drives unless you manually switch to them.

Here's how to select external drice F, as an example:

1. Ensure you're logged into WinSCP.
2. Click on the source area (left pane) to ensure the focus is on your local system (not on the server).
3. Press CTRL + o (Open Directory).
   a window will open
4. write F:\ (It must be a back slash).
   In WinSCP over SFTP → the server expects a Unix‑style path, not a Windows one.

The app always remembers the last used drive when you log in again.

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