I have found a very easy way to FTP into the Outernet foders. This is my solution to my setup, but others may find it usefull. I am running the standard Patch/LNA/SDR into a Raspberry Pi3 and am using a Raspberry Pi3 to connect into the Outnet server. With my “Desktop PI” I connect to the Outernet Hotspot. Open File Manager" with the “File to be uploaded” folder. Open a second “File Manager” and in the location bar, type in the FTP port, ie “FTP://10.0.01:21”. Sign into Outernet, and navigate the second “File Manager” to the destination folder. Drag and Drop from the first to the second. Close out all windwos and connections. You MUST reboot the Outernet server for it to reindex the file otherways you will get a “Critical File Error”. Weather Nullschool display runs like a champ, though there is no time stamp on it.
I hope this helps, and “SHOULD” work across platforms…