Moving USDC between Optimism and Arbitrum using app.optimism.io or bridge.arbitrum.io.
IMPOSSIBLE
Luckily, Wanchain's USDC XFlows has just launched on OP and ARB.
We Are All Connected.
Try XFlows here: bridge.wanchain.org
https://twitter.com/wanchain_org/status/1644388826796654621