Dropzone doesn't upload if file dropped (works if selected)

Hello, i made Dropzone (4.3.0) form that is combined with my form and should create new record on database after upload. …

It kinda works but. … It works if i select file. … But does not work if i drop file :frowning:

Here is code: http://phpfiddle.org/main/code/4fqd-5712
P.S. example doesnt work on phpfiddle

For information: Both select and drop file works on document edit but there i use stadart instant upload.
Just to note i cant use stadart on my example!

Any help? Thanks in advance!