\DocumentMetadata{testphase = {phase-II,sec,toc,graphic,minipage,float,text}}
\documentclass[a4paper]{article}

% Files
\usepackage[subpreambles=true]{standalone}
\usepackage{import}

% Font
\usepackage[T1]{fontenc}
\renewcommand{\familydefault}{\sfdefault}
\usepackage[nopatch=footnote]{microtype}

% Languages
\usepackage[french]{babel}
\frenchsetup{SmallCapsFigTabCaptions=false}
\usepackage{csquotes}
\MakeOuterQuote{"}

% Add \extra info to title
\makeatletter
\providecommand{\extra}[1]{
  \apptocmd{\@author}{
  \end{tabular}
  \par\vspace*{0.7em}
  \begin{tabular}[t]{c}
  #1}{}{}
}
\makeatother

% Change page dimensions
%\usepackage[
%  a4paper,
%  left=20mm,
%  top=20mm,
%]{geometry}

% Bibliography
\bibliographystyle{unsrt}
\nocite{*}

% Metadatas
\def\docTitle{TITLE}
\def\docAuthor{YOU}
\def\authorMail{mailto:place@holder.com}
\def\docSubject{SUBJECT}
\def\docLocation{LOCATION}

% Dependencies
\usepackage[
  pdfauthor={\docAuthor},   % author  metadata
  pdftitle={\docTitle},     % title   metadata
  pdfsubject={\docSubject}, % subject metadata
  hidelinks,                % clickable links in table of contents
]{hyperref}

\title{\docTitle}
\author{\docAuthor}
\extra{\docSubject~$\cdot$ \docLocation}
\date{}

\begin{document}
\maketitle
\flushbottom
\tableofcontents
\clearpage

\section{First section}
\import{sections/}{section1}

\section{Second section}
\import{sections/}{section2}

\section{Third section}
\import{sections/}{section3}

\clearpage
\appendix
\bibliography{sources}

\end{document}