From 1d383b0f4312e71c14c5a80474409ea46123c9fb Mon Sep 17 00:00:00 2001
From: Paul Popus <paul@payloadcms.com>
Date: Thu, 21 May 2026 16:35:48 +0100
Subject: [PATCH] fix: follow redirects when fetching uploaded files for MIME
 type detection

---
 packages/payload/src/utilities/addDataAndFileToRequest.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/payload/src/utilities/addDataAndFileToRequest.ts b/packages/payload/src/utilities/addDataAndFileToRequest.ts
index 771c613324f..a857c9c3601 100644
--- a/packages/payload/src/utilities/addDataAndFileToRequest.ts
+++ b/packages/payload/src/utilities/addDataAndFileToRequest.ts
@@ -102,6 +102,13 @@ export const addDataAndFileToRequest: AddDataAndFileToRequest = async (req) => {
           throw new APIError('Expected response from the upload handler.')
         }
 
+        if (response.status >= 300 && response.status < 400) {
+          const redirectUrl = response.headers.get('Location')
+          if (redirectUrl) {
+            response = await fetch(redirectUrl)
+          }
+        }
+
         req.file = {
           name: filename,
           clientUploadContext,