How to put Images inside a spoiler in my Signature?

[FedoraMaster03]

How can I put images inside spoilers in my signature? I've tried, but when I put an image in the spoiler no image shows and just shows.
How can I put images inside a spoiler in my signature?

 

[Matsu]

Use the BBCode

[spoiler=Title][img]Image URL[/img][/spoiler]

Check if it's working on the Information tab on your profile, not the Signature preview.