I have the same work flow for years and never have an issue, sketchup files, excel, layout files all in a local onedrive folder. No corruptions but I do have to close excel to update the data in layout and have gotten used to working that way. My guess, as I'm no IT guy, is how onedrive handle excels autosave feature where everything you do is saved immediately meaning the file is always being held by onedrive and layout doesn't like it. I've always wondered if turning autosave off would fix it. Or, because the feature exists, means layout can't never get full access to the data (because onedrive and excel are always connected) thus it's a Microsoft problem, not a layout problem. and potentially why most people are scared of corruption.