In the top left corner of your case management screen there is a Show Feed/Hide Feed tool that allows you to upload files up to 2GB in size.
Click on "Show Feed" to open the tool.
Click on the File link and select the file from your computer you would like to upload to the case notes. It may take some time to upload but there is a progress indicator.
Use this tool when uploading larger files such as nwtech scripts, sosreports and even core dumps to the case notes.