After reading a tutorial “Publishing and Sharing with SAP Lumira Cloud” by @DaveZMack I went straight to register for saplumira cloud beta. After few failed attempts (my own mistakes) I managed to register myself with SAP Lumira cloud beta. While I was playing with it I found that you can upgrade to Professional Edition for free during the beta. This will give us option to create a team with 5GB of storage for 5 users. So I did following steps.
Click on Settings > Select “Professional Edition”
Type “Team Name” and click on “Create Team”
That’s it. You are done. Now, you have 5GB space and you can invite another 4 users to collaborate.
Please note the when you invite users then it will ask them to register to this service. So in order to collaborate they must have SAP Lumira cloud account.
Thanks for your time.