handle multiple checkboxes required

app/javascript/submission_form/form.vue

@@ -527,7 +527,7 @@ export default {
     isButtonDisabled () {
       if (this.recalculateButtonDisabledKey) {
         return this.isSubmitting ||
-        (this.currentField.required && ['image', 'file'].includes(this.currentField.type) && !this.values[this.currentField.uuid]?.length) ||
+        (this.currentField.required && ['image', 'file', 'multiple'].includes(this.currentField.type) && !this.values[this.currentField.uuid]?.length) ||
         (this.currentField.required && this.currentField.type === 'signature' && !this.values[this.currentField.uuid]?.length && this.$refs.currentStep && !this.$refs.currentStep.isSignatureStarted) ||
         (this.currentField.required && this.currentField.type === 'initials' && !this.values[this.currentField.uuid]?.length && this.$refs.currentStep && !this.$refs.currentStep.isInitialsStarted)
       } else {
@@ -724,7 +724,7 @@ export default {
 
       stepPromise().then(async () => {
         const emptyRequiredField = this.stepFields.find((fields, index) => {
-          return index < this.currentStep && fields[0].required && (fields[0].type === 'phone' || !this.allowToSkip) && !this.submittedValues[fields[0].uuid]
+          return index < this.currentStep && fields[0].required && (fields[0].type === 'phone' || !this.allowToSkip) && !this.submittedValues[fields[0].uuid]?.length
         })
 
         const formData = new FormData(this.$refs.form)