I want to prefill a survey by populating the response table as if the participant already had started filling the survey but not submitted yet.
The "Lastpage" column in the responses table allows me to choose the page of the survey that appears when the participant opens the survey.
Everything works fine except when I try to point the very first page of the survey (welcome page). I assumed that I had to specify a value of -1 for the "Lastpage" column but it doesn't work.
Does anybody have an idea on how to point to this Welcome page ?