Hi
I can only give you some general idea and you have to customize the php file by yourself, and I can’t promise it will work fine, just a general idea, because the customization issue is not included in the service.
Edit content-slidedown.php, find the following code
<select name="post_type" id="post_type">
<option value="post"><?php _e('Blog Posts','Samsara');?></option>
<option value="portfolio"><?php _e('Portfolios','Samsara');?></option>
<?php if(is_plugin_active('woocommerce/woocommerce.php')):?>
<option value="product"><?php _e('Products','Samsara');?></option>
<?php endif;?>
</select>
Change to
<select name="post_type" id="post_type">
<option value="post"><?php _e('Blog Posts','Samsara');?></option>
<option value="portfolio"><?php _e('Portfolios','Samsara');?></option>
<?php if(is_plugin_active('woocommerce/woocommerce.php')):?>
<option value="product"><?php _e('Products','Samsara');?></option>
<?php endif;?>
<?php if(is_plugin_active('Your-plugin-folder/Your-plugin-main-file.php')):?>
<option value="ticket"><?php _e('ticket','Samsara');?></option>
<?php endif;?>
</select>
You should replace “Your-plugin-folder/Your-plugin-main-file.php” to the actual plugin folder and main file like “woocommerce/woocommerce.php”
Replace “ticket” to the name of plugin post type
Thanks