Great note taking app but requesting improvements – Notes Writer+ Review

I downloaded this app and found it to be outstanding in many respects. However, it would help if you made available Documentation for how to use it. Also, in the PDF documents, I was disappointed to see the absence of vertical (up and down) scrolling through the PDF. I really use this a lot in other apps. Am I missing something on how to do this, or is there a plan to include it in the future? Thx for your excellent work and responses to requests.
Review by BillyJoel1 on Notes Writer+.