Hi Anh,
It must be some issue with the group being within a set of tabs, but I have tried all of those methods of setting the default value and it works in the tab outside of the group, but not in the group that is also in the tab.
The handlebars around the 'group_title' are not working either except for the {#} in all other cases, it prints that actual handlebars to screen as a string.
The full code is here if you want to do some testing: https://bit.ly/2CXk8Ne
I can bypass each of those issues for now, the real issue is with the file delete. I'll follow up on that one in the other thread.
Thanks!