Hi there, I just switched over to an iPad Air from a Nexus 10. I'll be using it primarily to annotate textbooks and academic articles that I store on my Dropbox and need an app that can open the pdf, edit it and save it back to Dropbox (not keeping duplicate copies on my iPad) where I can view the notes on my laptop when writing up drafts. Does anyone have suggestions? GoodReader looks too clunky for my taste and also seems to create local duplicates. For reference, the app I was using on the Nexus 10 was RepliGo. Thanks so much!