Lightroom reading files from my machine without approval?!!?

I'm exploring Lightroom and it's photo/file management. I pointed LR to import photos from a file on my 😧 drive. After I started that, OneDrive started notifying me LR was requesting files to be downloaded from my Pictures folder (which is sync'd to OneDrive and mapped locally to my c:\.) I don't understand why LR would be looking at files anywhere else on my PC.