SUMMARY Okular highlights are not Gmail compatible (highlights are not visible in Gmail). STEPS TO REPRODUCE 1. Highlight any PDF with Okular highlights. 2. Email Okular highlighted PDF using Gmail. 3. Open Email and highlights are not visible. OBSERVED RESULT Highlights are not visible in Gmail. EXPECTED RESULT Highlights should be visible in Gmail. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION Linux Mint 20 Cinnamon (however, I believe that problem always existed with all versions). Thank you.
You'll have to explain me how that's an Okular bug and not a GMail bug. If the highlight works in Adobe Reader which is the defacto "this is right" renderer for PDF (and as far as i remember it does). GMail not rendering something is GMails bug.
*** Bug 429295 has been marked as a duplicate of this bug. ***