As you know, Microsoft has released about a week ago his new client operating system, Windows 10, which includes a new web browser called Edge.
You have to be aware that Edge and SharePoint do not like each others.
Many of the features available on SharePoint (both On Premises and Online) are not available with Edge; as part of these features not available (not exhaustive list):
- Drag and drop to upload multiple files
- Open with Explorer
- Connect to Office
For some of these incompatibility you can use Internet Explorer 11 – using the Open with Internet Explorer option BUT the drag and drop is still not available with the following error “Folders and invalid files can’t be dragged to upload.” while I was trying to upload multiple files with compatible name files