If you are using the free version of BIOD, then yes, you are limited to uploading RPT, static Webi. Or you can create datasets based on XLS. To upload PDF or MS Office documents, you need to be using Essential Edition or Advanced Edition. These 2 editions give you an "Organization" section (instead of just "My Stuff" and "Shared with Me"). The Organization section allows you to create folders, upload PDF/MS Office, and secure those folders with groups of users.
If you'd like, email me privately at SAP and we can discuss how to upgrade to Essential Edition.