Hello @Muiren,
We believe chrome has made some changes to their browser sockets API as we're able to replicate this issue with the SFTP account we have, so we'll investigate further into this and provide you with an update as soon as we can.
Are you using this app on a Chromebook? If you're using Windows, macOS or Linux, you can download our newer app here:
https://www.sftpapp.com/download
We originally had Discourse but was less manageable for us at the time.
Best regards
Danny