Hi IntenseJames
Are those files in DropBox on the Cloud or in a DropBox folder on your PC?
1
If those are in a DropBox folder on your PC:
Log into OneDrive in a Web browser - https://onedrive.live.com/about/signin/
Then drag that main folder into the OneDrive page in the web browser . .
2.
If those files are in DropBox online
You will have to download those to your PC and then upload those to OneDrive
Or
Use one of the online services that allow for transfer of files from one cloud service to another -