There’s not just one way of writing songs and as time flies you discover new ways. For quite a while now I’ve been using my smart phone for capturing new ideas. Sometimes even a whole song with piano or guitar. Just so we can listen again later.
The latest is to import these clips directly into Cubase and (when needed cut them up to fit the beat were it decided afterwards). This way you get a draft to improve gradually. And you can work on the song wherever you are. Below is the draft vocals for the bridge on our new project.