I am having issue with file upload function. It seems that it can't access filesystem write rights.
I set data and internal_data permissions to 0777, including subfolders. Plus I changed owner and group to the same user that runs nginx. Strangely but almost the same config works for my dev forum, but not for the main one. What can else be causing that error?XenForo_Exception: Failed to write the attachment file. - library/XenForo/DataWriter/AttachmentData.php:119