Files are not uploaded to Cloudflare R2 when clientUploads: true is enabled in the storage plugin

Describe the Bug

When using the Cloudflare R2 storage plugin, enabling the clientUploads: true option causes file uploads to fail.

Link to the code that reproduces this issue

https://github.com/gserrano-dev/payload_cms_r2_client_upload_bug

Reproduction Steps

• Setup Payload CMS cloudflare template
• Enable client uploads
• Upload a file

Which area(s) are affected?

plugin: storage-*

Environment Info

Binaries:
  Node: 22.12.0
  npm: 10.9.0
  Yarn: N/A
  pnpm: 10.28.0
Relevant Packages:
  payload: 3.79.0
  next: 15.4.11
  @payloadcms/db-d1-sqlite: 3.79.0
  @payloadcms/drizzle: 3.79.0
  @payloadcms/graphql: 3.79.0
  @payloadcms/next/utilities: 3.79.0
  @payloadcms/plugin-cloud-storage: 3.79.0
  @payloadcms/richtext-lexical: 3.79.0
  @payloadcms/storage-r2: 3.79.0
  @payloadcms/storage-s3: 3.79.0
  @payloadcms/translations: 3.79.0
  @payloadcms/ui/shared: 3.79.0
  react: 19.2.1
  react-dom: 19.2.1
Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.6.0: Wed Nov  5 21:32:38 PST 2025; root:xnu-11417.140.69.705.2~1/RELEASE_ARM64_T6031
  Available memory (MB): 131072
  Available CPU cores: 16