Either I'm missing something obvious, or else I no longer seem to be able to make annotations accessible to others, in my puzzle. Has the button for it moved?
It has changed slightly in the latest release. The option in the menu has been renamed to "solution settings". The dialog now has three options, the bottom one will include the annotations - you'll need to press the save button too now (that bit's new as well).
Thanks Raider, found it.