I wondered if you might revisit your plans re integration with hypothes.is (mentioned in a response to a [feature request][1] back in July) given the strength of their [recent announcement][2]?
I like the way that metaPDF is shaping up but I fear there will be a duplication of mark-up options and hypothes.is has certainly got considerable traction now.
Thanks.
[1]: Automagically check for corrections, corrigendums, and retractions
[2]: https://hypothes.is/annotating-all-knowledge/ “recent announcement”