Latex：图像未出现在 LaTex 文档中

Question

我知道这是一个常见问题。但是，我没有找到解决问题的方法。我用 LaTex 写硕士论文，编译时图像没有出现在 pdf 文档中。它也没有抛出任何错误，所以我很难过。

这是我的文档类和包；

\documentclass[
11pt, % The default document font size, options: 10pt, 11pt, 12pt
oneside, % Two side (alternating margins) for binding by default, uncomment to switch to one side
english, % ngerman for German
singlespacing, % Single line spacing, alternatives: onehalfspacing or doublespacing
%draft, % Uncomment to enable draft mode (no pictures, no links, overfull hboxes indicated)
%nolistspacing, % If the document is onehalfspacing or doublespacing, uncomment this to set spacing in lists to single
%liststotoc, % Uncomment to add the list of figures/tables/etc to the table of contents
%toctotoc, % Uncomment to add the main table of contents to the table of contents
%parskip, % Uncomment to add space between paragraphs
%nohyperref, % Uncomment to not load the hyperref package
headsepline, % Uncomment to get a line under the header
%chapterinoneline, % Uncomment to place the chapter title next to the number on one line
%consistentlayout, % Uncomment to change the layout of the declaration, abstract and acknowledgements pages to match the default layout
]{MastersDoctoralThesis} % The class file specifying the document structure

\usepackage[utf8]{inputenc} % Required for inputting international characters
\usepackage[T1]{fontenc} % Output font encoding for international characters
\usepackage{xcolor}
\usepackage{blindtext}
\usepackage{enumitem}
\renewcommand\thefootnote{\textcolor{blue}{\arabic{footnote}}}
\usepackage{mathpazo} % Use the Palatino font by default

%\usepackage[backend=bibtex,style=authoryear,natbib=true]{biblatex} % Use the bibtex backend with the authoryear citation style (which resembles APA)
%\usepackage[style=numeric,sorting=none]{biblatex}

%\addbibresource{example.bib} % The filename of the bibliography

\usepackage[autostyle=true]{csquotes} % Required to generate language-dependent quotes in the bibliography

\usepackage{graphicx} % Required for including images
\graphicspath{{Figures/}} % Location of the graphics files

这就是我为了显示图像所做的操作；

\begin{figure}[h!]
    \centering     %%% not \center
    \subfigure{\includegraphics[width=0.7\textwidth]{./Unet.PNG}}
    \caption{Unet Architecture!!}
    \label{fig:Unet}
\end{figure}

如果有人能帮助我，我将不胜感激。