What does Invitations to Interview look like on upwork?

Question

Upwork

I periodically get into Active Candidacies, but have never received an invitation to an interview. At the same time, clients correspond with me before throwing an offer. Sometimes for weeks.
1) Did I understand correctly that correspondence is not an interview yet?
2) What is cooler - Active Candidacies or Invitations to Interview?
3) What happens to the proposal when you receive an invitation for an interview or become a candidate. The fact is that out of ignorance he indicated "How long will this project take?" when sending a proposal less than a week. But the correspondence goes on for a week, it turns out that I can lose a potential client? proposal will stupidly disappear.
4) How Active Candidacies is displayed in the job view window in the column - "Activity on this Job". Are they added to "Interviewing"?

Answer 1

this interview is