Vue

HTML

<script src="https://cdn.jsdelivr.net/npm/vue2-dropzone@3.5.2/dist/vue2Dropzone.min.js"></script>
    <div id="app">
      <vue-dropzone ref="myVueDropzone" id="dropzone" :options="dropzoneOptions"></vue-dropzone>
      <button @click="updateUrl()">
      Update
      </button>
      URL : {{ dropzoneOptions.url }}
    </div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
      el: "#app",
      data: function(){
        return {
	          dropzoneOptions: {
            	url : "https://google.com"
          	}	
        }
      },
      components: {
        vueDropzone: vue2Dropzone
      },
      methods: {
      	updateUrl(){
          console.log(this.dropzoneOptions.url);
          this.dropzoneOptions.url = 'http://example.com';
          console.log(this.dropzoneOptions.url);
        }
      }
    })