Yes you can use a Ledger for both Ethereum and Optimism transactions. We recommend connecting your Ledger to your MetaMask wallet, you can read how to do so here.
Can I upload music with a Ledger?
Yes. If you are experiencing constant loading screens or any other issues while uploading with a Ledger then disconnect your Ledger, refresh your browser, and try again. If the problem persists, please reach out to us in Discord.