diff --git a/__tests__/services/transformer.ts b/__tests__/services/transformer.ts
index e56f4b08..22ef37ee 100644
--- a/__tests__/services/transformer.ts
+++ b/__tests__/services/transformer.ts
@@ -817,7 +817,7 @@ describe('service transformer', () => {
     }
     const output = {
       caption: body,
-      mimeType: mimetype,
+      mimetype,
       video: {
         url: link,
       },
diff --git a/package.json b/package.json
index 34af22f7..a9a0e939 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "unoapi-cloud",
-  "version": "0.17.1",
+  "version": "0.17.3",
   "description": "Unoapi Cloud",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
diff --git a/src/services/transformer.ts b/src/services/transformer.ts
index 59d730f7..509e98f5 100644
--- a/src/services/transformer.ts
+++ b/src/services/transformer.ts
@@ -64,7 +64,7 @@ export const toBaileysMessageContent = (payload: any): AnyMessageContent => {
     case 'video':
       const url = payload[type].link
       response.caption = payload[type].caption
-      response.mimeType = mime.lookup(url)
+      response.mimetype = mime.lookup(url)
       if (payload[type].filename) {
         response.fileName = payload[type].filename
       }
@@ -236,7 +236,7 @@ export const fromBaileysMessageContent = (phone: string, payload: any): any => {
       case 'documentMessage':
         const mediaType = messageType.replace('Message', '')
         const mediaKey = `${phone}/${whatsappMessageId}`
-        const mimetype = binMessage.mimetype.split(';')[0]
+        const mimetype = (binMessage.fileName && mime.lookup(binMessage.fileName)) || binMessage.mimetype.split(';')[0]
         const extension = mime.extension(mimetype)
         const filename = binMessage.fileName || `${payload.key.id}.${extension}`
         message[mediaType] = {