USDT and USDC exist on Ethereum (ERC-20), BNB Chain (BEP-20), TRON (TRC-20), and other networks. The symbol is the same; the underlying contract and address format are not.
Withdrawals from exchanges always label the network — match that label to Plume deposit step 2 exactly.
ERC-20 transfers pay ETH gas; TRC-20 uses TRX energy/bandwidth; BEP-20 uses BNB for gas.
On Plume, USDT and USDC balances are tracked per network bucket but display merged by ticker on Dashboard.