In the case of having multiple file upload fields for a particular answer field, you can specify the minimum number of files the respondent must upload. For example, if there are 5 file upload fields for the answer field "Favorite Pictures", this field can be set to the value 3 to force the survey respondent to supply at least 3 of their favorite photos to the survey if they wish to continue. The value for this field must be less than the Maximum # of Files.

When this field is set to 1, the behavior of the upload field depends on whether the field is set to required or not. In the situation where the response is not required, the value of 1 for this field is irrelevant since the survey respondent is allowed to ignore this upload field.