Annotation of a PDF file in my Dropbox in iPad and keep it the last version in Dropbox I have a folder in my Dropbox that I keep my eBooks in it. I want to find an app for the iPad that can do these to me:


Let me open a PDFs file from my Dropbox
Let me annotate on that file
Annotation getting applied to the Dropbox version of my file, instead of creating a local copy that its changes does not affect the Dropbox version


In my PC, when I open a PDFs file from my Dropbox and make Some highlights, when I press the save button in acrobat reader, the Dropbox version is instantly gets updated and whenever I open my Dropbox folder I have the latest version of the file. I need similar functionality in my iPad.

What iPad app has this functionality?
I am using PDF Expert for exactly this. You can choose to sync folders from Dropbox (and other sharing services). Those folders will keep a local copy and will automatically sync back as well.