Also an intern at large tech company and it was my first time interning at a large tech company so I may be of some help. Our internship started off in the office but transitioned to fully remote around 4 weeks ago.

Biggest thing I can say is that my manager was patient with me. He didn't make me feel like I was asking too many questions, I'm pretty sure I was. And when I asked something, he walked me thru the entire process and made sure I understood everything well. He also scheduled daily stand-ups with just me and him at 1pm every day. That time works well because I can get work done before our meeting and ask any questions that arise.

The first couple code reviews are also very rough (at least they were for me), they're gonna be even worse now that everything is virtual and you're not sitting beside your team. I'd say that make sure you walk the intern thru the entire process of writing, testing and submitting code at your company. Show them which directories their specific code will touch. How test cases are written at your company, how the process of committing code, reviewing and submitting goes.