Embed images in e-mail’s body using Microsoft Flow

I was working on my newsletter’s solution, aimed to automatically send prepared messages hosted in my SharePoint. Naturally, newsletters often contain images. Lots of them frankly speaking. The most straightforward approach was to insert them as a URL to the physical file stored in SharePoint (described here).  However, in that approach, if a recipient has no access to the site, where the file is hosted or is not yet logged in, the images won’t show up.