The email attachment failed. Maybe size. Maybe corporate filter. Maybe nobody knows why. You still need to get this PDF to the recipient.
What's actually going wrong
Email is one delivery path. There are many alternatives. The 'attachment failure' problem becomes a 'choose another channel' problem.
The quick fix
Compress first: Compress PDF — most attachment failures are size. Smaller files succeed.
Cloud share: Upload to Drive, Dropbox, or OneDrive. Email or message the share link.
WeTransfer: No-account file sharing. Upload, send link via any channel.
Messaging: WhatsApp, Slack, iMessage often handle PDFs the recipient's email rejects.
Direct transfer: AirDrop (Apple devices), Nearby Share (Android), or USB if in person.
If that didn't work
For PDFs that need to go through email specifically (workflow requirement), keep trying with smaller compressed versions. Or split into multiple emails.
For corporate filter blocks, contact IT for an exception or use the company's approved file-sharing service.
Prevent it next time
Always have an alternative delivery method ready. Keep cloud storage available. Use messaging for casual sends and email for formal ones.
FAQ
Which alternative is most reliable?
Cloud sharing (Drive, Dropbox) is most universal. WeTransfer needs no recipient account. Messaging apps work for chat-style sends.
Is sharing via link as professional as emailing an attachment?
For most business contexts, yes — many enterprises now prefer link-based sharing for security and version control. Casual contexts may still prefer attachments.
Can I track who downloaded my shared PDF?
Most cloud services offer download tracking on paid plans. WeTransfer notifies on download. Useful for important documents.
What if the recipient doesn't have a Google account?
Set Drive sharing to 'anyone with the link' for access without accounts. Or use WeTransfer / Dropbox which work for any recipient.
Attachment failure isn't the end. Compress in Flint or pick another channel.