I'm trying to add a table of contents to a document in Google Docs using Insert > Table of contents menu but it doesn't show any headings.
Here is a sample document: https://docs.google.com/document/d/1jAH3pmeRT2kyqGPOeUA2QaiqEOISNKM678kDx7XeVoQ/edit?usp=sharing
It has a Table of contents on page 1, Chapter 1 on p. 2 and Chapter 2 on p. 3. Chapters paragraph style is set to Title but they don't appear in the table. This is how the table actually looks:
I've pressed refresh button on the left many times - no effect.
I'm using web version of Google Docs. My browser is Google Chrome Version 62.0.3202.75 (Official Build) (64-bit). Cleaning cookies didn't help.