16.4-rc-1

• [***] Block Editor: New Block: File [https://github.com/wordpress-mobile/gutenberg-mobile/pull/2835]
• [**] Block Editor: Fixed an issue where a block would disappear when deleting all of the text inside without requiring the extra backspace to remove the block. [https://github.com/wordpress-mobile/gutenberg-mobile/pull/2877]
• [*] Block Editor: Fix Gallery block uploads when the editor is closed [https://github.com//pull/13570]
• [**] Posts List: Adds duplicate post functionality [https://github.com//pull/13521]
• [*] My Site: Fixes crash on rotation while editing site title [https://github.com//pull/13505]