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Windows 10 Version 1903
Microsoft have changed the Version Number on their latest Windows 10 Insider build to Version 1903 suggesting a Late March 2019 Release date. They have update the keyboard input methods:
Enabling the Paste Clipboard
Enabling the Touch Keyboard Button
Symbol Support in the Touch Keyboard
Symbol Support in Emoji Panel for Keyboard/Mouse Usage:
Paste Clipboard
Paste Options for Pasted Data from Paste Clipboard: