their trust wallet still supports BSC and ErC20 wallets so when you add the automatic network you can't see the incoming coins, if the coins are already entered look at other options either imtoken or MetaMask.
I see, thank you for correcting me. I don't know if trust wallet no support for matic network. Yeah many people using metamask to add matic network, actually safepal and MEW also support matic.
Maybe OP can using Metamask or MEW to add matic network