View an image at full size
When someone sends an image in a message, a thumbnail preview of the image will be generated in the message if the image is a common image type (i.e. PNG, JPEG, etc.).
To view the image in full size, click on the thumbnail preview of the image. Clicking it will open a lightbox modal with varying options depending on the media type.
Images can be opened in new tabs by clicking the Open button at the top right corner of the screen, but they also can be downloaded by clicking the Download button.
To exit out of the lightbox modal, click the x () icon in the top right corner or press the escape key.