I just use Dropbox. It's straightforward, on Mac/PC it's just use system reader. On iOS you can just open it with Dropbox itself. There are a lot of publicatio

I just use Dropbox. It's straightforward, on Mac/PC it's just use system reader. On iOS you can just open it with Dropbox itself. There are a lot of publications like Manning also have Dropbox integration, and automatically deliver new copy every time when new versions are available.