Hi LGLDSR73,
Thanks for sharing your concern. That message, Copy File Without Properties, shows up when you move files from an NTFS drive (like your C: drive) to an external drive using FAT32 or exFAT. These formats don't support NTFS features like file permissions or encryption. So, Windows warns you that these features won't be kept.
Some files copy fine because they only have basic data, but others trigger the message if they have NTFS-only stuff.
If you just want the file content, you can ignore the message. Only the extra info is lost. To keep everything, format the external drive to NTFS. Remember, this will erase the drive, so back it up first.
For compatibility with other systems, exFAT works fine, but it still won't keep NTFS properties. Also, if your files are from OneDrive, fully download them before copying. Placeholders can cause the message too.
Basically, it's not a file error. Windows is just saying the external drive can't store NTFS features. Your data is safe, but use NTFS formatting if you need everything.
Best regards,