To add multiple files to the file library:
1. Click on Library in the side navigation
2. Click on the downwards arrowhead ( v ) to the left of Add new Folder button and select the Upload Multiple Files option.
3. Click on the Upload Files link
4. Select which files you would like to upload, you can select multiple files in a folder by holding shift, command or control and clicking on the files.
Then click Open.
5. Ensure the files are uploaded successfully then click next