To start using your portfolio account, you'll need to add USDC native on Arbitrum to your 'unused funds'. It's very similar to how top-ups on your card work, but keep in mind that your 'unused funds' is linked to your embedded wallet.
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Below is a step-by-step guide on how to deposit.

Step 1: From portfolio, click 'Deposit'.

Step 2: Select 'Send crypto directly'. (The other deposit options are coming soon!)
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Step 3: Select 'Arbitrum' and 'USDC' to see your deposit address.

Please make sure that you send the right token on the selected network. Incorrect top-ups are irrecoverable, and your top-up will fail.