1) One drive reader should open the pdf from the last seen page(at least for offline saved files).
2) it should have a nice scroller to shuffle from one page to another quickly.
If this is done then one drive user will say good bye to any other pdf reader like adobe reader.
OneDrive now does this but it only returns to the same place when you close the file. When you are reading or annotating a PDF file, when you switch to another app temporarily and return, OneDrive will take you back to the place in the PDF where you last started. This is really annoying.