TemplateFREE⏱️ 45-90 minutes
File Sharing Feature Spec Template
Free template for designing file sharing and attachment features in SaaS products. Covers upload flows, access controls, preview rendering, storage...
Updated 2026-03-05
File Sharing Feature Spec
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Frequently Asked Questions
Should we build our own file preview or use a third-party service?+
For images and PDFs, build your own using open-source libraries (Sharp for image processing, pdf.js for PDF rendering). For Office documents, use a third-party viewer (Google Docs Viewer, Microsoft Office Online, or Zamzar). Building a reliable DOCX/XLSX renderer from scratch takes months and the result is never as good as the dedicated tools. Budget for the third-party API cost in your pricing model.
How do we handle file sharing with external users who do not have accounts?+
Generate signed, time-limited URLs that provide access without authentication. Include the file name and a preview in the link's landing page. Give the link creator controls: expiration date, password protection, view-only vs. download-allowed, and the ability to revoke access. Log every external access for the file owner's visibility and audit compliance.
What storage backend should we use?+
Amazon S3 or Google Cloud Storage for most SaaS products. Both offer high durability (99.999999999%), global CDN integration, and lifecycle policies for automatic archival of old files. Use S3 Standard for frequently accessed files and S3 Glacier for files older than 90 days. The cost difference is significant at scale (roughly 10x cheaper for archived storage). Consider data residency requirements when choosing regions.
How should file versioning work?+
Every re-upload of a file with the same name creates a new version. Display a version history sidebar showing all versions with timestamps, uploaders, and file sizes. Allow users to preview any version, download any version, and restore a previous version (which creates a new version rather than deleting the current one). Count only the latest version against the storage quota. For deeper version management, see the [version history template](/templates/version-history-template).
What are the GDPR implications of file sharing?+
If your users upload files containing personal data, you are a data processor. You must: honor deletion requests (delete the file and all versions from storage, not just the database reference), support data export (allow users to download all their files), log access for audit trails, and ensure data residency compliance if users are in the EU. Implement a "purge" function that removes files from primary storage, CDN cache, and backups within your stated deletion timeline. ---
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