I have drop down field on infopath form which comes from external list (from other SP list by data connection). This drop down list only accepts 255 Characters. When user select from drop down field it brings huge numbers of character from external list, and there are not able to submit the form. So that, How can I change this drop down list to multiple of text, maximizing 255 characters.
I just tried to check the Allow unlimited length checkbox on the list column's properties page, But I can't have option in SharePoint list.