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Hello @ajaysingh121
Ok, when you configure a DropDown field as multi-select, there are two alternatives. If you want the plugin sums or concatenate the values of selected choices by itself, you must tick the “Merge selected options” checkbox in the settings of the DropDown field. In this case, you can use the fieldname# as usual. If you untick the “Merge selected options” attribute, the field’s value will be an array with the values of the selected choices or an empty array if no option is selected.
Best regards.