Adding media to your Blog can be done from the Rich Text editor.
Types of media:
Select the image you would like to upload by clicking on the Upload Images icon in the toolbar. By clicking on the image once it's uploaded, you have the ability to have it resized, adjust the alignment, link it to another page or website or delete the image.
Video links can be added only for YouTube and Vimeo. To add a video to your blog:
To upload your Marmoset Viewer, simply click on the Upload Marmoset Viewer button and select your .mview file.
To insert your Sketchfab, follow the same process as inserting a video except click on the "Insert Sketchfab" button instead.