子文件中使用的包在 main.tex 中不起作用

Question

我遵循 Overleaf 的“子文件”示例

... 还有一些“诗歌”和“歌曲”包的例子

子文件运行良好，但当由 main.tex 调用时，歌曲包无法正常工作

这在 Latex 中很常见吗？例如，软件包不能与“子文件”一起使用

主文本

\documentclass{article}

\usepackage{subfiles} 

\title{Subfiles package example}
\author{Overleaf}
\date{ }

\begin{document}
\maketitle
\section{Poems}

\subfile{sections/poems}
%\pagebreak
\section{Songs}

\subfile{sections/cords}
\end{document}

cords.tex

\documentclass[../main]{subfiles}
\usepackage[chorded]{songs}
\noversenumbers

\begin{document}
\songsection{Worship Songs}

\begin{songs}{}
\beginsong{Doxology}[by={Louis Bourgeois and Thomas Ken},
                     sr={Revelation 5:13},
                     cr={Public domain.},
                     index={Praise God, from Whom all blessings flow}]
\beginverse
\[G]Praise God, \[D]from \[Em]Whom \[Bm]all \[Em]bless\[D]ings \[G]flow;
\[G]Praise Him, all \[D]crea\[Em]tures \[C]here \[G]be\[D]low;
\[Em]Praise \[D]Him \[G]a\[D]bove, \[G]ye \[C]heav'n\[D]ly \[Em]host;
\[G]Praise Fa\[Em]ther, \[D]Son, \[Am]and \[G/B G/C]Ho\[D]ly \[G]Ghost.
\[C]A\[G]men.
\endverse
\endsong
\end{songs}

\end{document}

诗歌.tex

 \documentclass[../main]{subfiles}
\usepackage{verse}

\begin{document}

\poemtitle{Mathematics}
\settowidth{\versewidth}{Than Tycho Brahe, or Erra Pater:}
\begin{verse}[\versewidth]
In mathematics he was greater \\
Than Tycho Brahe, or Erra Pater: \\
For he, by geometric scale, \\
Could take the size of pots of ale;\\
Resolve, by sines and tangents straight, \\
If bread or butter wanted weight; \\
And wisely tell what hour o’ the day \\
The clock does strike, by Algebra.
\end{verse}
\attrib{Samuel Butler (1612--1680)}

\end{document}