If it is a draft that is much harder since it is not in the service at all and only on the device. So it will be some manually copy of the data to get it off the device.
If this is because they aren't ready to submit the survey, why not include a field with select_one Draft and Submit? So they can send it to the cloud.
And then, you can tell Survey123 to send drafts back to the inbox. AND THEN you can edit it in the mobile or desktop app. JUST REMEMBER always refresh, so you have the current data in your inbox.
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