Yeah... it's a very undocumented area of work, heh. There are a few other apps who've tried this, but the part they seemed to struggle with was gaining traction

Yeah... it's a very undocumented area of work, heh. There are a few other apps who've tried this, but the part they seemed to struggle with was gaining traction being iOS only. Hope your experience differs! By the way, I actually open sourced my work on this some time ago: https://github.com/ryanmcgrath/cloudkit-sane-sharing https://github.com/ryanmcgrath/cloudkit-sane-sharing I had a few members of the iCloud team reach out after that to see if I wanted to interview with them. Without saying too much, I think they definitely are aware it could be used more widely... such a shame, it's a very well designed system yet gets the blanket "it's custom Apple built so thus it's odd junk" label.