First of all, I love the app! It’s as close to ideal version that I pictured in my head for my use case. The most crucial thing I’m still missing is the ability to add comments to pdf’s. Maybe there is an option to integrate the native macOS pdf markup SDK’s? Would also be awesome to see all the comments in an index in the right sidebar with page numbers. Especially for academic research this would be such a breath of fresh air.
Good luck with further developing the app!