If I create a survey in Survey123 web designer, but then want to add further more complex functionality only available through Survey123 Connect desktop app, can I do so before ever even publishing? I can see the survey listed online under My Surveys, but it doesn't show up in the Survey123 Connect's My Survey Design listings. Is there a way to do so?
To download a web designer survey in Connect, the survey must be published first. Once the survey is published, you will see it in your survey gallery in Connect.
Please note that once you've downloaded a survey in Connect and republished it, you will no longer be able to edit the survey in the web designer. Please find more info on updating surveys here: Publish your survey—Survey123 for ArcGIS | Documentation