after applying also suggestions about blanks in file names, I tried but the result is not what I'm trying to do.
I need to translate code as:
<div>
<p>vedi Fig._3.1 e Fig._10.6), allora si puņ.
</p>
</div>
into
<div>vedi Fig._3.1)
<p>
<img alt="Fig_3.1" src="../Images/Fig_3.1.jpg" style="font-size: 1em;"/>e Fig._10.6),
<img alt="Fig_10.6" src="../Images/Fig_10.6.jpg" style="font-size: 1em;"/>allora si puņ.
</p>
</div>
This is an extract (complete) from the original epub:
https://mega.nz/file/MP5WSSzZ#VL6BKb...Qf8WUsz3yfcB0U