I annotate stuff on pdf files using an ipad while I'm in class and when I come home, I use my laptop to do some further editing. This goes on for ~1 week on the same pdf file until my prof finishes the pdf. Whenever I edit a pdf file on my laptop, do I need to download that edited version on my ipad and upload it again to icloud after I annotate more notes in class? It seems like a lot of work to do this every day. When I had a surface pro, I would just upload the file on dropbox and edit directly from dropbox. Can ipad do something similar?