It’s probably not a recognized mime type.
Yep- go look in system/ee/EllisLab/ExpressionEngine/Config/mimes.php. Those are the mime types it knows. You need to add one- but not there, in the system/user/config/config.php file.
Try using the mime_whitelist_additions override
$config['mime_whitelist_additions'] = array(
'image/webp'
);
Tweaked my mime config as in Robin’s suggestion and what now allows EE to attempt to upload webp files but I am now getting:
Cannot Upload File Thumbnail could not be created for the image. Please make sure the thumbnail directory is writable.
To get around this is there a way to turn off thumbnail generation?
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