As of mid-2023, Krafton began splitting the delivery of the game. If you download PUBG Mobile directly from the on a modern 64-bit-only Android device (e.g., Pixel 7, S23 Ultra), you receive the 64-bit library automatically. The same goes for iOS; iPhones have been 64-bit only since the iPhone 5s.

of the application. The primary feature of this version is enhanced performance and stability for modern mobile devices. Key Feature: 64-Bit Architecture

If your phone supports it but the Play Store gave you the 32-bit version:

A competitive, esports-style mode in PUBG Mobile with no bots or recalls, featuring 64 players.

You cannot use your global account on the KR version.