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Email Attachment Icon Does Not Display on Emails Sent from the Lightning Email Action When Einstein Activity Capture Is Enabled

Date de publication: Jun 2, 2026
Description

Issue

In Lightning Experience, the email attachment icon disappears after an email with an attachment is sent from the Salesforce Email Action. The attachment is successfully sent to the recipient, but the attachment icon does not display in the Activity Timeline UI.

Affected Configuration

This issue only occurs when all three of the following conditions are true:

  • The org has Inbox or Einstein provisioned.
  • Einstein Activity Capture (EAC) is enabled.
  • The affected user is assigned to the Inbox permission set with EAC App Permissions enabled.

Steps to Reproduce

  1. Enable EAC (Einstein Activity Capture) in the org.
  2. From the assigned user's Inbox Permission Set, enable App Permissions for EAC (Einstein Activity Capture).
  3. Send an email with an attachment from the Lightning Email Action.
  4. After sending, observe that the Attachment icon does not display in the Activity Timeline.
Résolution

Explanation

This behavior is working by design. When Einstein Activity Capture (EAC) is enabled for a user, EAC takes over the email display functionality in the Activity Timeline (referred to as "Past Activity email crawling"). EAC crawls emails from Salesforce's server and currently supports emails only — file attachments are sent successfully but are not shown in the Activity Timeline UI because EAC does not currently support displaying file attachments in this view.
The email is delivered successfully to the recipient with the attachment. The limitation is in the UI display within Salesforce, not in the delivery of the file.

Workaround

To restore the attachment icon display, deselect EAC (Einstein Activity Capture) from the App Permissions on the assigned user's Inbox Permission Set. This removes EAC's control over the email display and restores the default attachment icon behavior.

Known Idea / Future Enhancement

A related product Idea requesting this functionality has been submitted and can be viewed here.

Numéro d’article de la base de connaissances

000385261

 
Chargement
Salesforce Help | Article