‘append’ called on an object that does not implement interface FormData

in order to use formdata with jquery you have to set the correct options

    url : "/function/pro_pic_upload.php",
    type: "POST",
    data : postData,
    processData: false,
    contentType: false,
    success:function(data, textStatus, jqXHR){
        $("#pro_pix img").last().show();
        $("#pro_pix img").first().hide();
        $("#pro_pix h6").text(data);
    error: function(jqXHR, textStatus, errorThrown){
        //if fails     

.ajax reference

processData (default: true)

Type: Boolean

By default, data passed in
to the data option as an object (technically, anything other than a
string) will be processed and transformed into a query string, fitting
to the default content-type “application/x-www-form-urlencoded”. If
you want to send a DOMDocument, or other non-processed data, set this
option to false.

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