从 .pdf 到 .odt 的转换：拉丁字符和重音问题

Question

我正在尝试使用以下工具将使用 latex 创建的 pdf 文档转换为 odt 或 doconline2pdf.com我的序言如下：

\documentclass[article,oneside, 12pt]{abntex2} 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Pacotes essenciais
\usepackage[alf]{abntex2cite} % Citações padrão ABNT
\usepackage[utf8]{inputenc}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Pacotes auxiliares
\usepackage{lipsum}
\usepackage{bibentry}
\usepackage{enumitem}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{amsmath}

所有拉丁字符（如 ç）和带重音符号的字母（ã、õ、í）均显示不正确，如下所示：

我想知道这是否与我的序言有关。