Multiple Tex files result in blank bibliography [closed]

Question

I have read multiple entries on this site for my issue but still cannot make the connection. I have main.tex, Frontmatter.tex, chapter1.tex and want to \input{Frontmatter.tex} and then have main.tex print the bibliography for all files to end the document. All files share the same bibliography (library.bib) How to I get citations from all files to write into one bibliography at the end of the document? main file included here:

\documentclass [12pt]{article}
\usepackage[american]{babel}
\usepackage[utf8]{inputenc}
\usepackage{csquotes}
\usepackage[backend=biber,style=apa,sortcites=true,sorting=nyt]{biblatex}
\DeclareLanguageMapping{american}{american-apa}
\usepackage{setspace}
\addbibresource{library.bib}
\usepackage[T1]{fontenc}
\usepackage{mathptmx}
\usepackage{amsmath}
\usepackage{amssymb,amsfonts,textcomp}
\usepackage{array}
\usepackage{hhline}
\usepackage[right=1in,left=1in,top=1in,bottom=1in]{geometry}
\usepackage{tocloft}
\addto\captionsamerican{%
    \renewcommand{\contentsname}%
    {\centering{TABLE OF CONTENTS}}%
}
\renewcommand{\cftsecleader}{\cftdotfill{\cftdotsep}}
\title{}
\begin{document}
\input{FrontMatter.tex}
\input{chapter1.tex}
\printbibliography
\end{document}