Aye! You sure can!
But if they have issues opening the file or folder, the problem may be that they must first accept W&L’s Terms of Service before they can access the content you’ve tried to share.
Have the outside user follow these steps outlined in these instructions:
https://wlu.box.com/v/nonWLbox
If that doesn’t work, contact the ITS Information Desk at help@wlu.edu or call 540.458.4357.