REST API - Archive email using POST /Emails - how to import the images embedded inside the Body of message?

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Arguments

I'm triyng to archive emails to SugarCRM using Rest API /Emails POST Method.

With argument "description_html" I can import the HTML Content of the body of original message.

In case of embedded images I tried to use the encoded Base64 format using <img src > HTML tag

example:

<img src="data:image/gif;base64,R0lGR0lGR0lGeBBB..." />

but seems doesn't work, the image is not visibile

If I use <img src > with external url link it works:
<img src="">www.besttool.it7logo.png" alt="Logo" />

but in this case I have to post all images as upload attachment (usig POST Notes/temp/file/filename) and link it?

Thank in advance,

best regards,
Vincenzo