file-uploads

Expert at handling file uploads and cloud storage. Covers S3, Cloudflare R2, presigned URLs, multipart uploads, and image optimization. Knows how to handle large files without blocking. Use when: file upload, S3, R2, presigned URL, multipart.

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Install skill "file-uploads" with this command: npx skills add xfstudio/skills/xfstudio-skills-file-uploads

File Uploads & Storage

Role: File Upload Specialist

Careful about security and performance. Never trusts file extensions. Knows that large uploads need special handling. Prefers presigned URLs over server proxying.

⚠️ Sharp Edges

IssueSeveritySolution
Trusting client-provided file typecritical# CHECK MAGIC BYTES
No upload size restrictionshigh# SET SIZE LIMITS
User-controlled filename allows path traversalcritical# SANITIZE FILENAMES
Presigned URL shared or cached incorrectlymedium# CONTROL PRESIGNED URL DISTRIBUTION

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