Would anyone be willing to help me sort out non-local WebDAV sync?

[chrillek]

Sorry for the wrong link that was apparently in my clipboard from. The correct one is

How to use Synology NAS as WebDAV sync location

Since the question arises occasionally, the following steps might help in setting up a Synology NAS as a WebDAV sync location for DEVONthink. This explanation uses port-forwarding. There’s a TL;DR about the basics that might help to set this up with another NAS. An alternative to port-forwarding would be to set up your router as a VPN server and your mobile devices as VPN clients to connect to it. install WebDAV from Synology’s packet repository in its settings, turn on HTTPS, leave HTTP off a…

and I fixed that in my post, too.