You can use the values from the previous file as default values for the next file. Just edit them into your upload.php.
Find:
echo " <input type=\"hidden\" name=\"$name\" value=\"\">\n";
change to:
echo " <input type=\"hidden\" name=\"$name\" value=\"{$_POST[$name]}\">\n";
Find:
<input type="text" style="width: 100%" name="$name" maxlength="$max_length" value="" class="textinput">
change to:
<input type="text" style="width: 100%" name="$name" maxlength="$max_length" value="{$_POST[$name]}" class="textinput">
Find:
<input type="file" name="$name" size="40" class="listbox">
change to:
<input type="file" name="$name" size="40" value="{$_POST[$name]}" class="listbox">
Find:
<textarea name="$name" rows="5" cols="40" wrap="virtual" class="textinput" style="width: 100%;" onKeyDown="textCounter(this, $max_length);" onKeyUp="textCounter(this, $max_length);"></textarea>
change to:
<textarea name="$name" rows="5" cols="40" wrap="virtual" class="textinput" style="width: 100%;" onKeyDown="textCounter(this, $max_length);" onKeyUp="textCounter(this, $max_length);">{$_POST[$name]}</textarea>
Find:
echo ' <option value="' . $album['aid'] . '"' . ($album['aid'] == $sel_album ? ' selected' : '') . '>' . (($vRes['name']) ? '(' . $vRes['name'] . ') ' : '') . $album['title'] . "</option>\n";
change to:
echo ' <option value="' . $album['aid'] . '"' . (($album['aid'] == $_POST['album']) ? ' selected' : '') . '>' . (($vRes['name']) ? '(' . $vRes['name'] . ') ' : '') . $album['title'] . "</option>\n";
Last one appears twice.