WinSCP (WINE)

WinSCP is a popular free SFTP and FTP client for Windows, here packaged with WINE. It copies files between a local and a remote computer using multiple protocols: FTP, FTPS, SCP, SFTP, WebDAV or S3. WinSCP offers an integrated text editor, scripting and task automation, integration with PuTTY, and support for SSH password, keyboard-interactive, public key and Kerberos authentication. It has both a two-panel Commander interface and an Explorer interface.

After installing, connect the two WINE content interfaces, or the application
will not start:

sudo snap connect winscp:wine-base-devel wine-platform:wine-base-devel
sudo snap connect winscp:wine-runtime-c24 wine-platform-runtime-core24:wine-runtime-c24

You may also want snap connect winscp:removable-media to reach USB disks and
other drives, and snap connect winscp:ssh-keys to reach OpenSSH keys in
~/.ssh.