Thanks for the reply.
Reading through the link you sent, it is not clear if someone without an arcgis account can edit a link.
Is it the "web hook" approach that you are suggesting? With this, can anyone update their survey answers? Can anyone edit any survey answers, or just their own?
Is the field app something open to the public? My understanding was that someone needed an app on their phone to use this service, which would be a high order for someone taking a public survey....
Are there any other creative solutions to saving data mid-survey? For example, could you link 2 surveys such that when someone clicks "submit", the data is saved and sent and a second survey opens to add the rest of the data?
Thank you