I downloaded the game on my laptop for over a year but never managed to figure out the save to file function. Can't switch devices and very disappointed :((( it will give me a file in"save" format but when I load it using the game in a different browser or android version, it never loads. And the copy to clipboard function isn't useful when there's nowhere to load text.
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I've had success from "save to file" via desktop/browser, and "load to file" to an android tablet/phone. You just need to copy the save file generated for "save to file" from desktop/browser to your android phone, and load it via either the browser or the apk using "load to file" and pointing it at the correct directory. The game between devices should be the same version tho.