Attach & Send guides

Practical guides for sending and collecting large files

Original engineering explanations, upload formulas, and client delivery checklists. No filler.

Guides6 min readReviewed 2026-11-01

How to Send Large Files by Email (Without Attachment Bounce-Backs)

Email protocols were never designed for multi-gigabyte binary payloads. Learn why 18.5MB files bounce on a 25MB limit and how expiring object-storage links solve delivery.

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Client Workflows6 min read

How to Send a Large Video File Without Losing Quality

Avoid chat-app transcoding and broken colour spaces when delivering client video cuts.

Reviewed 2026-11-01Read

Security7 min read

How to Share Files Securely: Passwords, Expiry and Threat Models

A transparent look at how link tokens, password challenges, malware quarantine, and short-lived presigned URLs protect your transfers.

Reviewed 2026-11-01Read

Engineering6 min read

What Is a Presigned URL? How Direct-to-Object-Storage Transfers Work

How Attach & Send moves multi-gigabyte files directly between the browser and private DigitalOcean Spaces while enforcing strict server-side verification.

Reviewed 2026-11-01Read

Guides5 min read

How Long Does a 5GB Upload Take? Formula & Real-World Overhead

ISPs advertise speed in megabits per second (Mbps), while files are measured in gigabytes (GB). Here is the exact formula.

Reviewed 2026-11-01Read

Client Workflows5 min read

How to Collect Large Files From Clients Without Portal Friction

Replace confusing shared folder permissions with a single 'Send me files' request link.

Reviewed 2026-11-01Read

Client Workflows5 min read

Client File Delivery Checklist for Freelancers & Creative Studios

Naming conventions, archive structure, link expiry windows, and download confirmations for professional handovers.

Reviewed 2026-11-01Read

Guides6 min read

WeTransfer vs Attach & Send: Factual Feature & Pricing Breakdown (Nov 2026)

Comparing guest transfer limits, password-protected links, recipient page experience, and monthly plan allowances as of November 2026.

Reviewed 2026-11-01Read