If you want to paste images into HTML Text inside radzen HTML-Editor then you have two possibilities:
1. You can store those images as files in folder on your webserver by configuring UploadUrl similar to this. In this case, your HTML Text automatically will contain a link to each image file:
2. You can store those images as inline base64 encoded strings directly in your HTML Text. This will make HTML much larger but also portable. For this UploadUrl has to be empty:
