diff --git a/app/api/sandbox/upload/route.ts b/app/api/sandbox/upload/route.ts
deleted file mode 100644
index 2fb52414b..000000000
--- a/app/api/sandbox/upload/route.ts
+++ /dev/null
@@ -1,41 +0,0 @@
-import { handleUpload, type HandleUploadBody } from "@vercel/blob/client";
-import { NextResponse } from "next/server";
-
-/**
- * POST /api/sandbox/upload
- *
- * Handles client-side Vercel Blob uploads by generating presigned tokens.
- * Auth is validated via clientPayload (the blob client controls its own
- * request headers, so we validate the token passed in the payload).
- * Files are temporarily stored in Vercel Blob, then the client passes
- * the blob URLs to the API which commits them to GitHub and cleans up.
- */
-export async function POST(request: Request): Promise<NextResponse> {
-  try {
-    const body = (await request.json()) as HandleUploadBody;
-
-    const jsonResponse = await handleUpload({
-      body,
-      request,
-      onBeforeGenerateToken: async (_pathname, clientPayload) => {
-        const payload = clientPayload ? JSON.parse(clientPayload) : null;
-        if (!payload?.token) {
-          throw new Error("Authentication required");
-        }
-
-        return {
-          maximumSizeInBytes: 100 * 1024 * 1024, // 100MB
-          addRandomSuffix: true,
-        };
-      },
-      onUploadCompleted: async () => {},
-    });
-
-    return NextResponse.json(jsonResponse);
-  } catch (error) {
-    return NextResponse.json(
-      { error: error instanceof Error ? error.message : "Upload failed" },
-      { status: 400 },
-    );
-  }
-}
diff --git a/lib/sandboxes/uploadSandboxFiles.ts b/lib/sandboxes/uploadSandboxFiles.ts
index dcfc685c6..df199d5af 100644
--- a/lib/sandboxes/uploadSandboxFiles.ts
+++ b/lib/sandboxes/uploadSandboxFiles.ts
@@ -40,8 +40,8 @@ export async function uploadSandboxFiles({
     files.map(async (file) => {
       const blob = await upload(file.name, file, {
         access: "public",
-        handleUploadUrl: "/api/sandbox/upload",
-        clientPayload: JSON.stringify({ token: accessToken }),
+        handleUploadUrl: `${getClientApiBaseUrl()}/api/sandboxes/staged-file`,
+        headers: { Authorization: `Bearer ${accessToken}` },
       });
       return { url: blob.url, name: file.name };
     }),