I installed the plugin version 3.0.4 but I do not see the button in the beckend articles.

Dear Lorenzo

Please go to the file: plugins\system\ytshortcodes\ytshortcodes.php and find:
$page = str_replace('<div id="editor-xtd-buttons">', '<div id="editor-xtd-buttons">' . $button, $page);
$page = str_replace('<div id="editor-xtd-buttons" class="btn-toolbar pull-left">', '<div id="editor-xtd-buttons" class="btn-toolbar pull-left">' . $button, $page);

=> Edit to:
$version = new JVersion();
if($version->RELEASE < '3.5' ){
$page = str_replace('<div id="editor-xtd-buttons">', '<div id="editor-xtd-buttons">' . $button, $page);
$page = str_replace('<div id="editor-xtd-buttons" class="btn-toolbar pull-left">', '<div id="editor-xtd-buttons" class="btn-toolbar pull-left">' . $button, $page);
}else
{
$app = JFactory::getApplication();
$editor = $app->getCfg('editor');
if($editor == "jce")
{
$page = str_replace('<div id="editor-xtd-buttons" class="btn-toolbar pull-left" role="toolbar" aria-label="Toolbar">','<div id="editor-xtd-buttons" class="btn-toolbar pull-left" role="toolbar" aria-label="Toolbar">'. $button.'</div><div class="toggle-editor btn-toolbar pull-right clearfix">', $page);
}
if($editor == "tinymce")
{
$page = str_replace('<div class="toggle-editor btn-toolbar pull-right clearfix">','<div class="toggle-editor btn-toolbar pull-right clearfix">'. $button.'</div><div class="toggle-editor btn-toolbar pull-right clearfix">', $page);
}else{
$page = str_replace('<div id="editor-xtd-buttons" class="btn-toolbar pull-left">', '<div id="editor-xtd-buttons" class="btn-toolbar pull-left">' . $button, $page);
}
}

if it doesn't work, please send us the admin and ftp account, domain in the website information box to check directly?

thanks

I found the file but I have some problem replacing the code. I send you the file, ytshortcodes.php, can you edit it correctly?
Thank you!

Lorenzo

Dear Dear Lorenzo

Please send us the information of your site in the website information box to check directly?
it is relate to your language and the editor that use in the admin

thanks