I am trying to upload thumbnails for Ideas in Ideation module and the extension of the files is not jpg but jfif (newer version of jpg). I have updated the extensions under Site settings to allow jfif extension. Also, have added the same extension to be allowed under Ideation application. Still I cannot view the uploaded file in the preview mode after the file is uploaded. Any and every help is really appreciated. My community version is 11.1.1.10427.