Clerk supports sending and receiving inbound and outbound MMS (media messages) right in Slack both on desktop and mobile apps.
Sending an image from Slack Desktop App
Inside of your Clerk SMS thread click on the Attach File.
Sending an image from Slack Mobile App
Slack UI sometimes hides the Attach File button. If you see the screen below, click the blue arrow pointing left to see the full Slack menu.
To send an image from your from your Slack mobile thread click on Attach File.
Supported Media File Types
Clerk offers support for common image file types: png, jpeg, and gif.
Media Size Limits
When you send an outbound message, the total message size must be under the maximum size of 5 MB