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Power Automate does not directly support attachments in Teams messages, but you can host the image online and use an image URL in the message.
Get the Image URL from Teams Library
Use the Image in a Power Automate Message
Add the "Post a message in a chat or channel" action.
In the message body, use the following Markdown syntax:

Example:
Hello Team, Please find the required image below: 
Send the Message & Verify
{ "type": "message", "attachments": [ { "contentType": "application/vnd.microsoft.card.adaptive", "content": { "$schema": "http://adaptivecards.io/schemas/adaptive-card.json", "version": "1.4", "type": "AdaptiveCard", "body": [ { "type": "Image", "url": "https://example.com/image.png", "altText": "Example Image", "size": "Medium" }, { "type": "TextBlock", "text": "Here is an image example in Teams!", "wrap": true } ] } } ] }
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Tom
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