diff --git a/src/main/services/S3Storage.ts b/src/main/services/S3Storage.ts
index 1f0760de7f..fd6af1e6f8 100644
--- a/src/main/services/S3Storage.ts
+++ b/src/main/services/S3Storage.ts
@@ -6,9 +6,11 @@ import {
   PutObjectCommand,
   S3Client
 } from '@aws-sdk/client-s3'
+import { FetchHttpHandler } from '@smithy/fetch-http-handler'
 import { loggerService } from '@logger'
 import type { S3Config } from '@types'
 import * as net from 'net'
+import { Agent as UndiciAgent } from 'undici'
 import { Readable } from 'stream'
 
 const logger = loggerService.withContext('S3Storage')
@@ -57,6 +59,20 @@ export default class S3Storage {
       }
     })()
 
+    // Create a direct dispatcher for S3 to bypass proxy
+    // This prevents proxy interference with large file uploads that can cause incomplete transfers
+    const directDispatcher = new UndiciAgent({
+      connect: {
+        timeout: 60000 // 60 second connection timeout
+      }
+    })
+
+    // Use FetchHttpHandler with direct dispatcher to bypass global proxy settings
+    const requestHandler = new FetchHttpHandler({
+      requestTimeout: 300000, // 5 minute request timeout for large files
+      dispatcher: directDispatcher
+    })
+
     this.client = new S3Client({
       region,
       endpoint: endpoint || undefined,
@@ -64,7 +80,8 @@ export default class S3Storage {
         accessKeyId: accessKeyId,
         secretAccessKey: secretAccessKey
       },
-      forcePathStyle: usePathStyle
+      forcePathStyle: usePathStyle,
+      requestHandler
     })
 
     this.bucket = bucket