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Upload-by-URL versus Direct File Upload

When to pass public media URLs to Postifys versus proxyDownload for Drive/Dropbox and resumable platform uploads.

Reviewed: 2026-07-24

Answer: Prefer public HTTPS CDN/S3 URLs. Use proxyDownload (or Drive/Dropbox auto mode) when the platform cannot fetch the source. Videos/Reels may still use resumable uploads after Postifys downloads the file.

Media requirements

Technical reviewer: Postifys engineering (docs sourced from live API behavior). Contact info@postifys.com.