Hi MTGS1,
Based on your description, I understand that you are using Mac and want to drag and drop one folder to another on a SharePoint site.
In this case, I’d like to explain that currently it’s not feasible to drag and drop one folder to another, I suggest you to submit your feedback for further improvement of our products. To make the suggestions better understood, please provide your detailed description on what you’d like to improve and detailed suggestions about what you have tested. This will make the feedback more useful for the relevant teams. You can submit your feedback at http://g.microsoftonline.com/0BX11EN/135. If the service is requested frequently, the product team may include it in future product releases.
Thanks,
Kevin Hu