To Generate CAS Reports on the tablet you will need to a PDF Reader. CAS will download reports but you wont be able to access or read them unless you have a PDF Reader.
Steps to install a PDF reader on tablet
1- Open Google Playstore app
2- Search PDF Reader
3- Download Adobe Acrobat Reader
Once installed you can generate a report on CAS from your tablet you will be able to open it with your PDF Reader and see your data corresponding to the report.