1. What is the problem? Be very detailed.
Following scenario: We collect data from respondents using Central/Enketo. Later, we want to collect data again using a different form ("follow up survey"). In both forms, respondents fill in the form themselves. Also, both forms start with a "Respondent Access Code" text field that uniquely identifies the respondent.
Now in the second form, some fields should be prefilled from the previous submission. I am aware that this is possible with secondary instances, however, to my understanding, the data in secondary instances is technically public, as it's just an attachment to the form that all browser clients receive in the background. For data privacy and security reasons, we would like a respondent to technically only have access to his/her own individual previous data.
Is there already an way of doing something like this?
I am imaging, for example, being able to have dynamic external secondary instances that are downloaded from a custom URL, like
https://example.com/data_xyz?respondent_access_code=<respondent_access_code>. But this is not possible, right?