Underlined part copy quickly
Hope it's possible to add a copy option in the pop-up window when clicking on the marked area after underlining or highlighting with a highlighter in PDF.
https://s3.amazonaws.com/zotero.org/images/forums/u15736329/8jdqr0pwii2f8uffol3i.png
https://s3.amazonaws.com/zotero.org/images/forums/u15736329/8jdqr0pwii2f8uffol3i.png
Upgrade Storage
(Also, something is wrong with your installation if you're seeing those strings ('general.yellow') for the color names. Restart in Troubleshooting Mode (Help → "Restart in Troubleshooting Mode…”), which temporarily disables all plugins. If that fixes it, you'll need to identify the plugin that's causing it and then report the problem to the plugin's developer.)