Need to add different images of signatories in the rtf template for a BIP report

Summary:

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I want to add signature's image to the letter which is in rtf template where path of the image is an XML element.

As far as i researched im supposed to give the url:{image_location} in the alternate text in format picture dialogue box.

But this isn't working for me. I couldn't see any image in the output.

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