You can add liquidity and swap tokens on Uniswap across multiple networks.
To add liquidity or swap tokens on a different network, you must first switch to that network.
To switch networks on the Uniswap web app:
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Open the web app and connect your wallet. Next, select the token drop-down.
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Select the network drop-down.
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Select the network you would like to use.
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Select the token you would like to swap or add liquidity for.
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The Uniswap web app will now be connected to the new network.