I'm using latest dropzone.js, version 3.2.0. I downloaded the folder and have all files needed. Using latest Chrome.
When i drop a file, dropzone sends it to the server, and i successfully save it, but nothing visual happens on the front end. 
I guess i'm missing something trivial. How to make dropzone show upload progress animation?
Another issue i have is that dropzone doesnt hide the div.fallback that contains fallback form.
I thought those features supposed to work automatically.
This sounds as if you didn't include the CSS files that come along with Dropzone.
Or you didn't add the dropzone or dropzone-previews class to your form.
Dropzonejs - Doesn't show progress bar / complete status and doesnt hide fallback form