R2 Storage Manager

This skill helps manage Cloudflare R2 storage and prevents common CORS/checksum issues.

Critical Patterns

1. CORS-Safe Presigned URLs

Always disable checksums and unhoist specific headers.

{
  ChecksumAlgorithm: undefined,
  unhoistableHeaders: new Set(["x-amz-checksum-crc32"])
}

2. Image Quality Standards

Ensure all uploads are 90% WebP. Context: features/image-upload.md