dropzone.js isn't starting to transfer files even with autoProcessQueue set to true -

i've set simple dropzone form accept images following settings:

<form action="/upload" method="post" class='dropzone' id='assetadd' enctype="multipart/form-data"></form> <script>   dropzone.options.assetadd = {     uploadmultiple: false,     maxfiles: 1,     maxfilesize: 10,     acceptedfiles: "image/*,*.jpg,*.gif,*.png"}; </script> 

however while can select image files , when see thumbnail , no errors in javascript console transfer never begins.

this mistake cost me 4 productive hours, hope can others end in same trap. problem comes misconfiguration of acceptedfiles, correct configuration should be:

acceptedfiles: "image/*,.jpg,.gif,.png"

a reference why can seen in source of dopzone (on line #176):

a file extension starting stop character (u+002e). (e.g.: ".jpg,.png,.doc") (source)

file extensions must start . , not work wildcard selectors on command line.