diff --git a/docs/site/content/en/docs/how-to/send-messages/index.md b/docs/site/content/en/docs/how-to/send-messages/index.md
index d8de13bc..1df33de1 100644
--- a/docs/site/content/en/docs/how-to/send-messages/index.md
+++ b/docs/site/content/en/docs/how-to/send-messages/index.md
@@ -273,6 +273,8 @@ You can send voice messages in two ways:
 1. Provide a URL for the voice.
 2. Encode the whole file content into base64 and send it in the request body.
 
+Please make sure your file has **OPUS** encoding and packed in OGG container.
+
 #### URL
 ```json
 {
@@ -280,8 +282,7 @@ You can send voice messages in two ways:
   "chatId": "11111111111@c.us",
   "file": {
     "mimetype": "audio/ogg; codecs=opus",
-    "filename": "voice-message.mp3",
-    "url": "https://github.com/devlikeapro/whatsapp-http-api/raw/core/examples/dev.likeapro.mp3"
+    "url": "https://github.com/devlikeapro/whatsapp-http-api/raw/core/examples/dev.likeapro.opus"
   },
   "caption": "string"
 }
@@ -319,7 +320,7 @@ You can send voice messages in two ways:
   "file": {
     "mimetype": "video/mp4",
     "filename": "video.mp4",
-    "url": "https://github.com/devlikeapro/whatsapp-http-api/raw/core/examples/dev.likeapro.mp3"
+    "url": "https://github.com/devlikeapro/whatsapp-http-api/raw/core/examples/video.mp4"
   }
 }
 ```
diff --git a/examples/dev.likeapro.mp3 b/examples/dev.likeapro.mp3
deleted file mode 100644
index 3205fdbd..00000000
Binary files a/examples/dev.likeapro.mp3 and /dev/null differ
diff --git a/examples/dev.likeapro.opus b/examples/dev.likeapro.opus
new file mode 100644
index 00000000..fab7a8e6
Binary files /dev/null and b/examples/dev.likeapro.opus differ
diff --git a/src/structures/chatting.dto.ts b/src/structures/chatting.dto.ts
index 5b1869a6..dcfa6ddf 100644
--- a/src/structures/chatting.dto.ts
+++ b/src/structures/chatting.dto.ts
@@ -171,8 +171,8 @@ export class MessageLocationRequest extends ChatRequest {
 class FileRequest extends ChatRequest {
   @ApiProperty({
     oneOf: [
-      { $ref: getSchemaPath(BinaryFile) },
       { $ref: getSchemaPath(RemoteFile) },
+      { $ref: getSchemaPath(BinaryFile) },
     ],
   })
   file: BinaryFile | RemoteFile;
@@ -190,8 +190,8 @@ export class MessageFileRequest extends FileRequest {
 export class MessageVoiceRequest extends ChatRequest {
   @ApiProperty({
     oneOf: [
-      { $ref: getSchemaPath(VoiceBinaryFile) },
       { $ref: getSchemaPath(VoiceRemoteFile) },
+      { $ref: getSchemaPath(VoiceBinaryFile) },
     ],
   })
   file: VoiceBinaryFile | VoiceRemoteFile;
diff --git a/src/structures/files.dto.ts b/src/structures/files.dto.ts
index 2d4ef19e..9ac3728a 100644
--- a/src/structures/files.dto.ts
+++ b/src/structures/files.dto.ts
@@ -1,4 +1,5 @@
 import { ApiProperty } from '@nestjs/swagger';
+
 export class Base64File {
   mimetype: string;
   data: string;
@@ -70,14 +71,9 @@ export class VoiceRemoteFile {
   })
   mimetype = 'audio/ogg; codecs=opus';
 
-  @ApiProperty({
-    description: 'Document file name. Optional',
-  })
-  filename = 'voice-message.mp3';
-
   @ApiProperty({
     example:
-      'https://github.com/devlikeapro/whatsapp-http-api/raw/core/examples/dev.likeapro.mp3',
+      'https://github.com/devlikeapro/whatsapp-http-api/raw/core/examples/dev.likeapro.opus',
   })
   url: string;
 }