My main issue with linking in Pupper Post currently is the Markdown syntax is transformed to the rich text equivalent in the editor after saving a draft and previewing it. I would prefer if it retained the original formatting when the Markdown editor preference was set.
After publishing, the angle bracket link and the toolbar button link were transformed to regular Markdown links, so looks like those or the raw text links are the best options. Leaning raw text links because then can paste into email etc, a la Cory Doctorow’s https://pluralistic.net
After I edited the published post, the syntax reverted to rich text until I toggled the General Settings > Editor option from Markdown to Rich Text (and back) while inspecting a post after each change. That seems to wake the presentation back up when it gets stuck in rich text.
Test linking
Raw text link
Angle brackets
Markdown link
Using toolbar button