Ken Case ( tweet ):
At that time, there was no built-in document reader, or even a rich text editor: if we wanted these features – essential for apps like OmniGraffle and OmniOutliner – we had to build them ourselves.[…]
In 2019, we think it's time to pull our custom document reader to the advantage of using Apple's built-in document reader – and with our iOS 13 updates this fall, we'll do just that. Instead of viewing our custom file browser, you will be presented with the standard iOS document reader – just like in Apple's own iWork apps. Using Apple's browser, you will be able to store and sync your documents using Apple's built-in iCloud Drive, or third-party commercial options such as Box ̵1; or even cloud or self-hosted git storage with Working Copy.  I look forward to being able to access direct files from Working Copy. This way, I can sync files to the iPhone directly from the Mac without having to upload them to any cloud provider. It also means I can be certain that certain files are with me, while the Files app can't easily cache entire folders offline and can't trust that they won't clean the cache elsewhere.
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