Have I lost my files to OneDrive?

I assume it defaulted to the OneDrive settings on Windows 11. When I copied my files/data (30GB) from an external drive onto my computer, OneDrive promptly began giving me error messages (not enouhg storage space?) and selling me additional storage. I am on the free account with 5GB of free storage and don't wish to purchase more. I want to retain my files on my local hard drive, and use OneDrive for maybe a few select folders.