bug fixes

src/components/Preview.vue

@@ -16,6 +16,6 @@ const officeUrl = $computed(() => {
 </script>
 
 <template>
-  <iframe allowfullscreen :src="officeUrl" frameborder="0" style="width: 100%; height: 100%" v-if="officeUrl"></iframe>
+  <iframe allowfullscreen :src="officeUrl" :key="officeUrl" frameborder="0" style="width: 100%; height: 100%" v-if="officeUrl"></iframe>
   <object :data="url" style="width: 100%; height: 100%; object-fit: none" v-else></object>
 </template>