How do I get the APK file for an Android app?

After I update my Android's Play Store app through sideloading apk, will it still be able to get any future update through OTA?

I mean, Play Store doesn't support sideloaded apps, right? So, I'm curious if the Play Store itself won't get updates after being updated by apk?
Answer:

Apps are signed by publishers, and you can't forge a signature. If your sideloaded APK is official, it will replace the existing APK, because the signatures and package IDs will match. If it's unofficial, it will be installed alongside the existing app, and you definitely should not trust it, because it's been altered. As long as the signature is Google's, when you attempt an update that offers a Play APK, the incoming APK will replace your APK, even if it's technically an older version.

Paul Buonopane at Quora Visit the source

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