If you are hosting your web app on a web server (like you should) then there is really not much to consider regarding images, other than for you to minimise file sizes to improve app load times. Images are often cached so subsequent loads are less of an issue.
If you are streaming HTML from SAS though, images are more of a challenge. This is where
base64 encoding comes in. Essentially this technique lets you save an image as a long string.
There are many online services that will convert an image into a Base64 string for you, eg: https://base64.guru/converter/encode/image.
When streaming through the SAS _webout fileref, be aware that you are likely to hit the line length restriction. To avoid this, set a large value for
lrecl or ensure that your data is streamed byte by byte.
If you use the
sasjs-cli tool, this part will be handled for you.