diff --git a/examples/aws-nodejs/index.js b/examples/aws-nodejs/index.js
index febb4f810..ae496293b 100644
--- a/examples/aws-nodejs/index.js
+++ b/examples/aws-nodejs/index.js
@@ -357,7 +357,7 @@ app.delete('/s3/multipart/:uploadId', (req, res, next) => {
 
 app.post('/s3/presign', async (req, res, next) => {
   try {
-    const { method, key, uploadId, partNumber } = req.body
+    const { method, key, uploadId, partNumber, contentType } = req.body
     const client = getS3Client()
 
     if (!method || !key) {
@@ -381,12 +381,14 @@ app.post('/s3/presign', async (req, res, next) => {
       command = new PutObjectCommand({
         Bucket: bucket,
         Key: key,
+        ContentType: contentType || 'application/octet-stream',
       })
     } else if (method === 'POST' && !uploadId) {
       // CreateMultipartUpload
       command = new CreateMultipartUploadCommand({
         Bucket: bucket,
         Key: key,
+        ContentType: contentType || 'application/octet-stream',
       })
     } else if (method === 'POST' && uploadId) {
       // CompleteMultipartUpload
diff --git a/examples/aws-nodejs/public/rewrite-test.html b/examples/aws-nodejs/public/rewrite-test.html
index 3833fb9e2..350c19370 100644
--- a/examples/aws-nodejs/public/rewrite-test.html
+++ b/examples/aws-nodejs/public/rewrite-test.html
@@ -65,7 +65,6 @@
             id: 'AwsS3-STS',
             bucket: window.UPPY_S3_BUCKET, // Set by server
             region: window.UPPY_S3_REGION || 'us-east-1',
-
             // Get temporary credentials from /s3/sts
             getCredentials: async ({ signal }) => {
               const response = await fetch('/s3/sts', { signal })
@@ -100,7 +99,6 @@
             id: 'AwsS3-Sign',
             bucket: window.UPPY_S3_BUCKET,
             region: window.UPPY_S3_REGION || 'us-east-1',
-
             // Sign requests via /s3/presign endpoint (returns presigned URLs)
             signRequest: async (request) => {
               const response = await fetch('/s3/presign', {
@@ -111,6 +109,7 @@
                   key: request.key,
                   uploadId: request.uploadId,
                   partNumber: request.partNumber,
+                  contentType: request.contentType,
                 }),
               })
               if (!response.ok) throw new Error('Failed to get presigned URL')
diff --git a/packages/@uppy/aws-s3/src/s3-client/S3.ts b/packages/@uppy/aws-s3/src/s3-client/S3.ts
index d26e3df2f..676cf02b7 100644
--- a/packages/@uppy/aws-s3/src/s3-client/S3.ts
+++ b/packages/@uppy/aws-s3/src/s3-client/S3.ts
@@ -236,6 +236,7 @@ class S3mini {
       key,
       uploadId,
       partNumber,
+      contentType,
     })
 
     // Build request headers
diff --git a/packages/@uppy/aws-s3/src/s3-client/types.ts b/packages/@uppy/aws-s3/src/s3-client/types.ts
index 8a2b51251..227efd3ab 100644
--- a/packages/@uppy/aws-s3/src/s3-client/types.ts
+++ b/packages/@uppy/aws-s3/src/s3-client/types.ts
@@ -5,6 +5,7 @@ export type presignableRequest = {
   uploadId?: string
   partNumber?: number
   expiresIn?: number
+  contentType?: string
 }
 
 /** Response with the pre-signed URL */