Clear dropzone.js thumbnail image after uploading an image

removeAllFiles() and removeFile() will trigger the server-side removal too, if you hooked Dropzone to remove files as well.

The solution to clear it only client-side, remove the file preview, and if you had a blank state message, remove the dz-started class to prevent the Dropzone CSS from hiding it:

$('.dropzone')[0].dropzone.files.forEach(function(file) { 
  file.previewElement.remove(); 
});

$('.dropzone').removeClass('dz-started');

You can try this:

myDropzone.on("complete", function(file) {
  myDropzone.removeFile(file);
});

More information here: http://www.dropzonejs.com/#dropzone-methods