I put all my books into a Calibre library on Dropbox and open them in Apple Books via files or CC. Does ubooquity offer something more?

I’m missing something that can markup on PDFs and highlights/notes on epubs dont sync back to the original file because iBooks has it’s own copy. But I haven’t found a clear solution to this yet - one app that supports reading both PDF and epub and will sync annotations back into the file or a server. Send me recommendations please! Can ubooquity help here?