Suppose I have a footer that is writen in shortcode with visual compose and I wanna put an image:
[vc_single_image image="8469" img_size="full" alignment="center"]
where do I find the image value 8469?
You can go to your WP admin and go to Media.
Click the image you want to use. It should open up in a Modal with the image on one side and details on the other. when this happens the url of the page changes to something like:
/wp-admin/upload.php?item=180
Or if it opens up in its own page then you will see link like: /wp-admin/post.php?post=180&action=edit
.
Where 180 is the image's id
stored in the database. Which is exactly what you need to replace in your shortcode's image
attribute