GPGSv2 snapshots

Hi everyone! I have a question according to gpgsv2 snapshots. In my app I have two buttons with load and save data, but I need only one button, where user would be able to add or delete data saves. I found that it can be done by using gpgs.snapshots.show. Although I don’t know how to do it. I’ve already read the documentation but there aren’t enogh to me. I would be very grateful for your help!