iOS page fitting options

Would someone be able to explain to me the difference between the following page fitting options in the iOS app? When I'm zoomed in on a page, the options don't appear to do anything different.

* Fit
* Fill
* Automatic

https://drive.google.com/file/d/1jpDuwtKP-bvLMDtFb_gvyubVwX5mTpYj/view?usp=sharing

This is with version 1.0.1 Build 1.
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