The Rocketbook app is supposed to have an
export .txt to filesystem
option but I just can’t see how to do it in Android. The menu option doesn’t seem to be there, unlike the iPhone app.
So I use an app called “Handwriting to text” instead. This does handwriting conversion better than the Obsidian plugins that I’ve found.
Handwriting conversion needs AI level OCR. Sadly, I haven’t found any AI OCR solutions that don’t use a cloud service to do this because unfortunately it’s only the likes of Azure handwriting OCR that can do it properly because they’ve taken the time to match handwriting samples to typed text, and that asset isn’t available open source (for example).
So let this be a warning that if you want to convert your handwritten notes privately and securely, it generally has to go through a cloud service first at the moment.