I’m not sure where those instructions are from but they seem to be for two different uses. For images, first check you are using a supported image format for embedding.
Deb, I’d be curious to know what you’re ultimate goal is by having the images in TBX. Are you looking to eventually copy and paste, print, or export your notes? FYI, here is a video about a file I’ve created that shows a number of different wasy to working with images: 5Cs TBX Media Library and Templates Overview.