Ok thanks, makes sense

So I finished Story Quest 1-3 on my first character of the account and when I went to my second character on the account it didn't have any available. So my question is, is the story quest shared between all your characters on the account? Like can you resume story quest where you left off on any of the characters of the account. I even checked on my second low level character and it can invite everyone from the story even though it hasn't done anything. So a clarification on this would be appreciated and thanks.