Hello Magnus,
Thank you for your message.
We definitely plan to implement the File Transfer connection mode in one of the subsequent releases of Viewer for Linux and Mac. Unfortunately, we cannot provide any specific ETA on when the connection mode will be available. However, with each release we update the list of the features available in the current beta version of Viewer for Mac/Linux, so as soon as the File Transfer connection mode is available you will see it on the list in the very first message on
this page.
Please let us know if you have more questions.