Cardinalflyer reported an issue where dragging a URL with spaces into a post would encode the space as %20, but then the % would be further encoded to %25, breaking the link. This issue is demonstrated with the example URL https://www.lycoming.com/sites/default/files/Engine%20Timing%20Marks.pdf. pfaffman suggested that the issue may have been fixed recently, pointing to a similar bug report: Evernote oneboxes have extra %25 for each % in URL. Cardinalflyer confirmed this, realizing they had searched for the wrong keyword (%20 instead of %25).
I see in the preview window it decodes it properly into spaces. I’m on a Discourse version from July 15th… any chance this was fixed lately? It is also working in the resulting post here. On my system I get the following… not the URL preview on the status line of the browser: