How Should RPG Books Be Organized - on your shelf?

[giant.robot]

Can ask what your preferred way of reading PDFs is? I find myself moving in a similar direction. Currently mostly using iPad and Apple Books for syncing, but iCloud is on the pricey side, though I do like the bookshelf view and manual sorting of shelves

GoodReader on iOS is great. You can manage files and folder inside the app, sync directly from cloud storage, and even upload through a web UI. It's a good PDF reader as well by not clouding the UI with a bunch of garbage.