Hello MattRessBF, my name is Irisdiel and I am an independent advisor.
Down below I have listed a method that should help with your drag and drop issue.
Method: The solution: Left click a file, keep the left click pressed and then hit the
Escape key
When drag and drop doesn't work, left click a file in Windows Explorer or File Explorer, and keep the left click mouse button pressed. While the left click button is held down, press the Escape key on your keyboard, once. Release the left click mouse button.
If that solution didn't work then another possible issue could be with your mouse driver.
A link that may help you with more information with your mouse driver id down below:
https://support.microsoft.com/en-us/help/17417/...
Thank you and good luck.
Regards- Irisdiel H.