Hi tiagovtg,
OK Firstly a word of Warning regarding Permissions of 777 full permissionsI hope you only use 777 permission in testing locally because of testing this upload issue
Otherwise you could be asking for trouble especially in a production environment (I trust you are aware of this)
Cook most certainly does not need 777 permissions to complete the upload process
Cook CHMOD Defaults are as follows FOLDERS 744 AND FILES 644 (from memory)
I suspect that it is related to the fact that you have changed the default upload directory (this is not a problem if done correctly)
For example on a windows system when you set the upload directory as you have
/images/xxx it will be located in C:\images\xxx
But the default directory for upload would be similar to
C:\...\...\yourjoomladirectory\components\com_yourcomponent\files\some_fieldname
As we can see these two directories are far different to each other and i suspect this is why you can not locate your uploaded files
So Now How to Set your image directory correctly???
There are a number of predefined "MARKERS" for file upload
[ROOT] Joomla Root
[COM_ADMIN] Component Admin Root
[COM_SITE] Component Site Root
[ADMIN] Administrator root
[IMAGES] Site Images Root
[MEDIAS] Site Media Root
From the Administrator Side Config for your component... hover over the label Upload dir. and you will see the above
Anyhow looks like your trying to upload to the site images directory so the answer is simple
Alternatively you can test upload to default directory by clearing the override in the upload dir. field (leave it blank)
hope it helps
BTB300