Do you have frontpage role set to guest? When you refer to database I assume you are talking about the upload data file? It works for me as a link from a 'web page'. I actually did a tut video on the setting I used.
Security Note- I have front page set to default role of guest and have modified guest to allow submission of questionnaires so that the contact us form will submit without visitors creating an account here. Typically I would not suggest setting a school's default front page role as guest. I would suggest leaving it blank.