.unknown file extension for uploaded documents

[steveschiltz]

Hi,

my problem is that when I upload files they get the extension .unknown

Drupal 7.56
Civicrm 4.7.23
Documents 1.8

Message displayed :

Notice: Undefined index: attachDesc_1 in CRM_Core_BAO_File::formatAttachment() (line 554 of /home/setciexg/public_html/modules/civicrm/CRM/Core/BAO/File.php).

Does this have anything to do with the documents extension

[jaapjansma]

Could you explain a little bit more on when this happen and what your actual issue is, is the notice or the .unknown extension?