So, what I ended up going with (after trying several things)
- Set up Obsidian vault on my iOS device.
- On my Macbook, tell Resilio Sync to sync the iCloud Drive folder for Obsidian.
- On my PC, I now have the folder synced via Resilio Sync.
iOS <—> Macbook <—> PC
I know iCloud Drive can be fiddly and get out of sync amongst multiple devices, but I don’t intend to do lost of simultaneous edits.
The only problem I anticipate is if my Macbook remains powered off for an extended period of time. In that case, edits from iOS wouldn’t get synced to the PC and vice versa.
I did actually recently find out that you can supposedly sync iCloud to a Windows PC., but I haven’t tried it. I’d like iCloud to be involved as little as possible.