After a few days stumbling around webDAV (and failing), I’ve tumbled into a happy place where I am able to sync my Obsidian notes. In my case that ended up being an Amazon S3 bucket, but if you’re looking to sync your notes to the cloud I can heartily recommend a community Obsidian plugin called ‘Remotely Save’. It supports a variety of cloud providers. You can set the sync frequency and, I must say, it’s a huge plus.
Cheerio.