As an EA, you know that personal preference and trust are always top of mind. We would recommend discussing with your exec where classified information lives, and who should have access to it.
Here at Coda, our CEO and his EA have a doc shared between the two of them, that stores his personal information, notes, etc. There is a separate doc with resources, musings, and tools and tips to work efficiently with him, this doc is open to the entire company.
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