Not an expert and just sharing what is working for me:
- Install the iOS app.
- Select the Logseq folder under iCloud Drive.
- Install the macOS app.
- Select the same folder as before.
- Ensure that iCloud Drive is enabled in phone’s settings when using mobile data.
This way I use Logseq on my MacBook Pro and iPhone. I haven’t tried using another Mac computer but am sure it will work fine as long as you aren’t editing the same page on more than 1 device at any given time.
For definitive sync, you could subscribe to the official sync service which costs $5 a month.
At this time, I don’t see a need for it for my usage.