Well, it depends on the platform. For example, on Instagram, if you have created a highlight from your posts or reels, you can usually share it to your story. There will be an icon or a menu option that enables you to do so. However, some platforms might have restrictions or different procedures for sharing highlights. So, check the specific features and settings of the platform you are using.
Most of the time, yes. Social media platforms are designed to preserve the quality as much as possible when sharing highlights to stories. But it also depends on the original quality of the content in the highlight.
It could be that the function to highlight isn't available for your specific story. Sometimes it depends on the format or source of the story. Also, make sure you have the latest version of the app or software you're using.
Perhaps your story didn't meet certain criteria for highlighting in 2019. Maybe it was related to content quality, formatting, or compliance with the platform's guidelines.