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Attachments

Attachments allow you to include supporting files with your email campaign message. These files are sent to every recipient and are limited to a combined total size of 20 MB per template.

Where to Manage Attachments​

Attachments are managed in the Attachments tab of the email template editor during campaign creation or editing.

Adding Attachments​

  1. Open the Attachments tab in the template editor.
  2. Click the upload area or drag and drop files to begin uploading.
  3. Each file uploads asynchronously; you can continue working on other parts of the template while uploads are in progress.

Size Limits​

LimitValue
Maximum total attachment size20 MB per template
Number of attachmentsNo fixed limit (constrained by total size)

If the total size of all attachments exceeds 20 MB, further uploads are blocked. You must remove one or more attachments to free up space before adding new ones.

Attachment States​

Each attachment can be in one of the following states:

StateDescription
UploadingThe file is being uploaded to storage. A progress indicator is shown.
CompleteThe file has been successfully uploaded and is ready to send.
FailedThe upload encountered an error. The file can be retried.
Previously UploadedThe file was uploaded in a prior session (e.g. when editing a campaign or importing a template).

Removing Attachments​

  • Click the remove button next to any attachment to delete it from the template.
  • You can remove an attachment in any state, including while it is still uploading.
  • Removing an uploading attachment immediately cancels the upload process.

Retrying Failed Uploads​

If an attachment upload fails:

  1. The attachment shows a Failed state with a retry option.
  2. Click Retry to attempt the upload again.
  3. Failed attachments are not automatically removed; they remain in the list until you retry or remove them.

Template Export and Import​

When exporting or importing templates, attachments follow specific rules:

  • Completed attachments are included in the export.
  • Attachments that are still uploading or failed are excluded from the export.
  • If any attachment is uploading when you trigger an export, you are warned that in-progress uploads will not be included.
  • On import, attachments from the file are restored and marked to indicate they were imported from a previous export.

For the full guide to template import and export, including file types and editor matching rules, see Importing and Exporting Templates.

Run and Summary Modals​

  • When viewing a campaign summary or the Run Campaign modal, all attached files are listed.
  • Each attachment can be downloaded individually from the summary or run modal.
  • If the campaign has no attachments, the attachments section is hidden.

Best Practices​

  • Keep total attachment size well under 20 MB: large attachments increase delivery time and may be blocked by recipient email servers.
  • Wait for uploads to complete before finishing or exporting the campaign.
  • Retry failed uploads promptly: failed attachments are not sent with the campaign.
  • Use common file formats (PDF, DOCX, XLSX, PNG, JPG) for maximum recipient compatibility.