Lost $200 because of lack of information. Made a Polygon withdrawal to a Polygon address in another wallet and never received it. Turns out Coinbase uses the Ethereum (ERC20) network to send Polygon, instead of the Polygon(MATIC) network. I was only able to find this out because the Nexo Wallet informed me. Coinbase support said they can't help me. This and many other defects is why this app is complete trash.