anyone can upload IMAGE to signature ? vbulletin 5.5.5

[betadoor]

hi,

i try to upload GIF file or all types of images to signature system of vBulletin 5.5.5 but i can't.
please try it yourself and check.

what i do ?
i go to setting of user, click account and edit signature by clicking on "Edit Post Signature".
than i upload image file (click on "upload attachments" and select file) and.... its not work !

i get only 2 option after i upload:
1. Thumbnail
2. Remove

when i choose one option ("Thumbnail") i don't get anything...only [SIGPIC][/SIGPIC]

:erm:

[betadoor]

???