That's uncomfortable, but true. When you hit the share button in X (Twitter), all that is shared is the link to the post, but not the post itself. That's why the idea in Napkin appears empty, without any content.

The best way to collect ideas on X(Twitter) currently is to copy the text, switch over to Napkin and add the idea. Let us know if we should prioritize working on a fix here. The more people let us know, the sooner we'll get to it.