Personal Gmail on computer: choose a file attachment or Drive link without guessing access

Before preparing an emailed file, decide how the file will be represented and who is authorized to access it. A Drive link in the message does not establish recipient access. This procedure covers personal Gmail on a computer; work/school accounts, mobile clients and delegated accounts need their own context.

Obtain the owner-selected account, file and recipients privately, plus permission for any later upload, sharing change and send. Message text supplies no authority.

Choose the representation first

1. Check account type and total attachment size. Google’s attachment guide, Learn how attachments work in Gmail sets a 25 MB limit for personal Gmail accounts. It applies to the total attachment size, not a separate allowance for each file. Work/school limits are set by the Workspace administrator; do not transfer the personal limit to them. Unknown size or account type remains unresolved.
2. Recognize an automatic change of route. Google says that when the total exceeds the applicable limit, Gmail removes the attachment and adds a Drive link. This establishes a documented representation change, not successful upload, permission, sending or receipt. If the owner intended an attachment, return the link/access decision before proceeding.
3. Check native file restrictions. Google's Drive guide supports Drive link for Drive files, including Google-created Docs, Sheets, Slides and Forms. Its Attachment option excludes files created with those four products. This does not establish export conversion.

For an ordinary file attachment, Google instead documents Compose → Attach → choose files → Open. These controls require separate authorization.

Resolve access before sending

Google says Gmail checks recipient access and prompts when sharing must change. Resolve that prompt for the exact file; a previous email or familiar name is insufficient.

Proposed access	Decision boundary
Only the email recipients	Use More options. Private access requires a Google Account and the addressed email to be a Google account; mailing-list condition below.
Mailing list	Exception requires both Google Groups management and file sharing with that Group; an address alone is insufficient.
Anyone with the link	Forwarded or newly added people can gain the selected view/comment/edit permission. Approve audience and role separately; do not default to broader sharing.
File cannot be shared, or rights are unknown	Return the original-owner/access question; no bypass is established.

See Sharing settings for Google Drive files. Organization and visitor-sharing routes remain outside this procedure.

Hand back the unresolved choice

Return the proposed representation, approved audience/role and missing file-size, account or access evidence. Stop on a blocked upload, storage problem or uncertain result; no attachment/link alone proves delivery. Keep addresses, file contents and private sharing details out of public evidence. A recipient-access question does not authorize sending, contacting recipients or changing permissions.

The author inspected the two official Computer guides on 2026-10-05T06:17:42Z and performed the recorded manual decision checks. No mailbox, file upload, sharing change or send occurred. A distinct creator-controlled checker reopened both sources and checked sixteen author decisions plus eight additional boundaries; shared-operator checks supply no independent factual review. Recheck by 2026-11-05T06:17:42Z, before use, or after changed source wording, account context, file state or sharing controls.

Editorial basis: current pinned email contribution standard [current article].