diff --git a/backend/src/plugins/Post/util/postMessage.ts b/backend/src/plugins/Post/util/postMessage.ts
index f8b375b0..5bb13095 100644
--- a/backend/src/plugins/Post/util/postMessage.ts
+++ b/backend/src/plugins/Post/util/postMessage.ts
@@ -30,6 +30,7 @@ export async function postMessage(
       name: attachments[0].name,
       file: await fsp.readFile(downloadedAttachment.path),
     };
+    content.files = [file.file];
   }
 
   if (enableMentions) {
@@ -38,12 +39,7 @@ export async function postMessage(
     };
   }
 
-  let createdMsg;
-  if (file) {
-    createdMsg = await channel.send({ ...content, files: [file.file] });
-  } else {
-    createdMsg = await channel.send(content);
-  }
+  const createdMsg = await channel.send(content);
   pluginData.state.savedMessages.setPermanent(createdMsg.id);
 
   if (downloadedAttachment) {