Allow image/link previews
Note: This feature can only be controlled by organization administrators.
By default, when a user uploads or links to an image or links to a website, a
preview of the content will be shown. You can choose to disable previews of
images and links separately.
Go to the Organization settings
tab of the Manage organization page.
Select the Show previews of uploaded and linked images or the
Show previews of linked websites checkbox under the Message feed
Click on the Save changes button to save any changes you made to your organization settings.