VirtoSoftware released Office 365 Bulk Files Uploader add-in
Virto Bulk Uploader add-in for SharePoint Online allows users to upload multiple files to a SharePoint library and add attachments to list items.
Now, you can upload files from your computer to SharePoint with drag-and-drop feature and set properties for these files. Also, administrator can restrict file types and size to upload.
Learn more about all features on the product page Virto Office 365 Bulk Files Uploader