Minitoc not showing at the start of a chapter

I have included the command usepackage{minitoc} in preamble and amended the code

AtBeginDocument{
dominitoc
dominilof
dominilot
hypersetup{pdftitle=ttitle} % Set the PDF's title to your title
hypersetup{pdfauthor=authorname} % Set the PDF's author to your name
hypersetup{pdfkeywords=keywordnames} % Set the PDF's keywords to your keywords
}

After begin{document} I then have

tableofcontents % Prints the main table of contents
bigskip
mbox{Word count: wordcount words} % Add word count at end of contents table

listoffigures % Prints the list of figures
listoftables % Prints the list of tables

And then within the subfile Chapter1.tex I have the format:

% Chapter 1
documentclass[main.tex]{subfiles}
begin{document}

chapter{Introduction} % Main chapter title
label{Chap1:Intro} % Change X to a consecutive number; for referencing this chapter elsewhere, use ref{ChapterX}
minitoc

%----------------------------------------------------------------------------------------
%   SECTION 1
%----------------------------------------------------------------------------------------

section{The Steam Turbine}

When compiling the document though no minitoc shows at the start of Chap.1.
Why is this? Is minitoc compatible with subfile?