I saw the developer reply for this Feature for over 10 years and now still no this feature?
You can do this using the Secure ShellFish app:
- add the SSH/SFTP server to Secure ShellFish
- enable Secure ShellFish location in the Files app
- add the server as an external folder to Textastic (see https://www.textasticapp.com/v9/manual/integration_other_apps/external_files_folders.html#adding-external-folders)
This allows you to edit files lives on an SFTP server.
Customer support service by UserEcho