I have mentioned my MWE below. I will try to get the alternative text output for each figures. So, i am using the pdfcomment package and my TeX code is used to pdftooltip{\includegraphics{example-image-duck}}{Alternative Text}.
MWE:
\documentclass{article}
\usepackage{graphicx}
\usepackage{pdfcomment}
\begin{document}
\section{PDF comment alt text not working on PDF accessbility alternative text}
\begin{figure}[!h]
\centering\pdftooltip{\includegraphics{example-image-duck}}{Alternative Text}
\caption{Sample Figure Cation.}
\end{figure}
\end{document}
The alternative text is working good through mouse over action.
But, the PDF accessibility is not supported because the alternative text to be reflected in the form field text. My requirement is the text to be filled alternative text field.
I check this action through Adobe Professional 11 for the following method
Accessibility - Add Tags to Document -> Touch Up Reading Order
I have attached the image screenshots for your clear understanding.
Alternative text field is empty:

Form text field contains the text:

Could, you please advise how to get the text in alternative text field through latex code.