Add a WebDAV Connection
After opening the File Transfer screen, tap on the “+” button and choose WebDAV Connection to add a new connection.
You can add a custom title that will appear in the connection list.
In the URL field, enter a valid http or https WebDAV URL.
If your WebDAV server requires a login, you can enter a user name and password.
For HTTPS connections you can choose whether Textastic verifies the SSL certificate of the server. Disable this if you use a self-signed certificate on the server.
Tap Done to save this connection and return to the list of remote connections.
You can now tap on the newly created connection to connect to your Google Drive account.