Thanks for your response! After your advice I changed the data channel security setting to "clear" in the app and I checked that session re-use was not required by the server, which it wasn't. However when I tried to connect I got the same blank screen but this time the message at the bottom was "52...

I have an OpenMediaVault server set up and would like to transfer files between it and my phone using FTPS with a custom SSL certificate that I have generated. I imported the SSL certificate and root signing authority to both my laptop and phone. Using WinSCP I have verified that the SSL certificate...