Does the Glip chat API support image (photo) attachments?

I'm using the Glip API to post messages. I can post images from the Glip UI but I don't see an option to post images. Does anyone know how to do this?

• Glip API: https://developer.ringcentral.com/api-docs/latest/index.html#!#RefGlipCreatePost

Glip recently launched the file upload API which can be used to attach images. You could also try it out using our API Explorer.