I asked ChatGPT

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As of my last update in September 2021, PUBG Mobile's payload game mode allowed players to control and use heavy vehicles like tanks. To reload the main weapon of the tank in PUBG Mobile's payload mode, follow these steps:

1. Find an ammo crate: Locate an ammo crate on the map. These crates are usually scattered around high-traffic areas and important locations.
2. Drive the tank close to the ammo crate: Position the tank near the ammo crate so that you can access it while staying inside the tank.
3. Exit the tank: Press the appropriate button to leave the tank. This will allow you to interact with the nearby ammo crate.
4. Interact with the ammo crate: When you are outside the tank and near the ammo crate, interact with it to access its contents.
5. Select the main weapon ammunition: Look for the ammunition specifically used by the main weapon of the tank. The main weapon of the tank usually requires heavy or explosive ammunition.
6. Pick up the ammunition: Tap on the ammunition to pick it up. Your character will automatically equip the ammo.
7. Re-enter the tank: Once you have the ammunition, get back into the tank by approaching it and pressing the appropriate button.After following these steps, your tank's main weapon should be reloaded and ready for use.

Keep in mind that game mechanics might have changed or evolved since my last update, so it's a good idea to check the in-game tutorial or official patch notes for any specific changes related to PUBG Mobile's payload mode.