This problem will involve the following two situations:

The first is that you withdraw funds to your own wallet, you have your own private key, and BSC,ETH,HECO actually uses a set of private keys and addresses. Go to the platform where you withdraw coins to see which chain you're mentioning, then go to the wallet and configure the RPC node.

The second: the mentioned platform does not support this chain tokens into the account, such as firecoin now does not support the BSC chain USDT into the account, but you played the past, how to do, provide the transfer of hash and screenshots, and so on, to find the platform's customer service consultation process, because you the address of the private key in the platfor However, because of the protection of the platform assets, processing time will be lengthier, and a fee will be charged.