Defines a file selection dialog (file picker) in the questionnaire. When the questionnaire is processed, the template generates the path of the file concerned (e.g., of the company logo of a new contact). For transferring the file to the database, the Save answer in field action needs to be specified in the questionnaire, including the corresponding action parameters, e.g., /CONTACT/PICTURE.
When the questionnaire is saved, the file is transferred to the server, is processed by the action and, in this case, associated with the contact. You can use this functionality also for other files that should be saved together with the questionnaire, e.g., as documents.