How can I paste / embed images in to OWA messages?

Pasting images into messages is not an OWA feature. There are two workarounds to getting images into your message:

1. You can paste HTML links to images, but this means that the image needs to be stored on a public server. An example of this would be when you copy an image from a website and then paste it into an OWA message
2. You can embed images using Outlook, which actually stores images as attachments, making them available for recipients using OWA to see.

There is a Microsoft knowledgebase article, available below, which explains how to paste an image into the OWA signature. The workaround does not always seem to work and is not supported by Microsoft as an official solution.

How to get an image into the signature file in OWA
https://social.technet.microsoft.com/forums/en-US/exchangesvrclients/thread/1bb882b3-03dc-4085-ae06-a787fd76fd39/