use vue for form submission

app/javascript/flow_form/image_step.vue

@@ -0,0 +1,67 @@
+<template>
+  <div>
+    <img
+      v-if="modelValue"
+      class="w-80"
+      :src="attachmentsIndex[modelValue].url"
+    >
+    <button
+      v-if="modelValue"
+      @click.prevent="remove"
+    >
+      Remove
+    </button>
+    <input
+      :value="modelValue"
+      type="hidden"
+      :name="`values[${field.uuid}]`"
+    >
+    <FileDropzone
+      :message="'Image'"
+      :submission-slug="submissionSlug"
+      :accept="'image/*'"
+      @upload="onImageUpload"
+    />
+  </div>
+</template>
+
+<script>
+import FileDropzone from './dropzone'
+export default {
+  name: 'ImageStep',
+  components: {
+    FileDropzone
+  },
+  props: {
+    field: {
+      type: Object,
+      required: true
+    },
+    submissionSlug: {
+      type: String,
+      required: true
+    },
+    attachmentsIndex: {
+      type: Object,
+      required: false,
+      default: () => ({})
+    },
+    modelValue: {
+      type: String,
+      required: false,
+      default: ''
+    }
+  },
+  emits: ['attached', 'update:model-value'],
+  methods: {
+    remove () {
+      this.$emit('update:model-value', '')
+    },
+    onImageUpload (attachments) {
+      this.$emit('attached', attachments[0])
+
+      this.$emit('update:model-value', attachments[0].uuid)
+    }
+  }
+}
+</script>