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Canned Responses templates are held in text form. Every formatting is held in Markdown. Files cannot be held as text there but images can be transformed in order to be used in templates. |
Instructions
Get a PNG or JPG image file
Encode it to Base64 format (e.g. by uploading the file to https://www.base64-image.de/)
Get the resulting Base64 code of your image, that should look like:
Code Block data:image/png;base64,iVBORw0...alotofdatahere...ErkJggg==
Put your image code where normally a URL should go in Atlassian Markdown link syntax:
Code Block 
Put the whole code where the image should be in your Canned Responses template.
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