Third party integrations - it would be great if you could have a selection of third party integrations for your export/share options. Right now its so limited that it would be terrific if there was an api that third party platforms could publish a destination to. So I could export to buffer, hootsuite, simplebooklet, pipedrive, mailchimp, etc.. Not that adobe would need to build this, but make it possible for these platforms to build for spark. Canva does this with their app marketplace and as far as I can tell they are the only one that does this in this competitive space.