For long pieces of computer code and for images, there is a SUSE/openSUSE paste site.
For long code sessions it is easiest to use the susepaste tool:
some command | susepaste
Link is also in your clipboard.
You can also go to https://susepaste.org/ and upload there (for am image see the word Image at top-right).
After you did this, you can copy/paste the URL from the page as shown in the address bar of your browser (and not the URL of the image itself). Paste this using the Link button (the one with the globe) from the toolbar of the post editor.