If Smart Switch still doesn’t work, you can try using Odin to flash the official firmware. Otherwise, you’ll need to wait for the official update release, or visit a service center to have the device rolled back to the official firmware.

https://news.samsung.com/global/samsung-one-ui-8-beta-will-be-open-for-more-galaxy-devices

I’ve replied to you directly in the Members app, please check your messages or inbox there. Not sure why my replies here aren’t showing.

Yes, it’s normal those are likely Google Play Store update files for your device’s architecture.

Phonesky is the internal codename used by Google for the Google Play Store application. It's also the name of the .apk file for the Play Store.