If so, you need SAP Universal ID. In a few months, SAP Universal ID will be the only option to login to SAP Community. Without it, you will lose your content and badges. If you have multiple accounts, use the Consolidation Tool to merge your content.
When using the GOS Class the user can Attach documents one by one. But is it possible to let the user Attach multiple files in one step (by selecting multiple files with SHIFT or CTRL button upon file selection)?