File upload error. Cannot upload .key (keynote) files I am trying allow users to upload keynote and powerpoint files. Powerpoint works fine. Keynote fails. I do not have any asset type restrictions in place. Why am I unable to upload asset type .key?
It looks like .key files are not included in the default allowed file extensions. But you can manually add it with the extraAllowedFileExtensions setting in your config/general.php file:

'extraAllowedFileExtensions' =&gt; 'key'