Hey Julien,

I am sorry for the delay of this reply,

Unfortunately we do not have avatar integration with AUP in current system yet.

Perhaps you can try take a look of their AUP API -> http://casite-537542.cloudaccess.net/images/zoo/uploads/developer_documentation_1.7.x_english.pdf (Page 9)

And you can check one of our avatar integration code e.g. Jomsocial avatar integration
JoomlaFolder\administrator\components\com_easyblog\includes\avatar\adapters\jomsocial\client.php

Then add an new AUP avatar integration option from this file
JoomlaFolder\administrator\components\com_easyblog\themes\default\settings\layout\avatars.php

Hope this will help.