>>- If you want to send files from W10 directly to your Linux host, the host must run a protocol Windows understands e.g. SMB/CIFS [Samba], or run an FTP or NFS server and use appropriate client software on W10. Of course the Linux host firewall must be configured to allow client access
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>Blind spot. It would probably be the easiest to just run a ftp server, but in my mind ftp is always somewhere out there, not something one uses at home. Forgot completely.

If you find yourself lashing together multiple steps to do something that should be easy, it's time to get another pair of eyeballs on the problem. Or have a beer and figure out some other way to cut the Gordian knot (which as I understand it originated somewhere in your neck of the woods).