Thanks @hedaja ! It was super easy to install the Android pre-release. For others out there, follow @hedeja 's link to GitHub, click to open the Assets section under the most recent release, and download the file that ends in .apk (it was the first one listed when I downloaded it just now). I had to give Chrome permission to install the app (it’s not yet official app, so Android wants to make extra sure you’re ok with this). After granting that permission, iNat Next installed easily. And it’s awesome!!! So many great features and upgrades! 
Can’t wait to try it out
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