I would quite like the ability to markup PDF plates with my own comments / notes as part of my planning process.  On PC this is very easy as the PDF is opened int he default viewer / editor so comments can be added and save. Those comments even get rendered when the PDF is georeferenced.

Is there a way on iPad to open up the downloaded version of a PDF (e.g.  AIP approach plate) in Adobe Reader so comments can be added for later viewing within Skydemon during flight?