Please note that you cannot upload SCORM packages using these methods. To upload a SCORM package, please follow the instructions found in this article.
Go to Teaching on the left and click on Materials. Click the blue icon at the top right of the page to upload files.
Select +More Options from the drop-down and then Mass Uploads. From the menu that appears, browse through your files by clicking on Select Files.
To pick more than one file, hold CTRL/Command while clicking on the files you want to add. Once the file has uploaded click on Add Files.
You can also Drag and Drop your file and upload it this way.