This is a setting within the email-channel in Trengo.
Navigate to settings --> email and click on the channel to edit it.
Next, within the chapter "advanced" you will find the setting "Embed attachments", make sure this setting is enabled to embed attachments instead of getting a link.
Tamara Berner When using the Trengo forward email setup, this option is indeed available. However, the email channels using the Outlook Beta do net seem to have this option available in the advanced section nor anywhere else?