After creating a "classic" project (since sub-tasks are apparently not available on next-gen projects) then creating a task (Epic), there's no option to create a sub-task anywhere until I click it to be the old-style task layout (which I'm actually not finding again), which then gives me the option under menu to Create a Sub-Task...
Once a sub-task has been created, then a + button appears in a new Sub-Tasks section on the next-gen ticket, but before that, that section is not there...
So how are we supposed to create sub-tasks even on classic projects in Kanban? I'm not even seeing the option when creating a new task... Jira was so useful at my previous job, now I convinced our team to upgrade after explaining sub-tasks and they're almost impossible to find now.