Only image types show in gallery list [Widget AttachmentsTableWithPreview]

[adiramardiani]

I use attachment with image and office (pdf,word,excel, ppt, etc)
For the non image type file, AttachmentsTableWithPreview widget still show up this type

I think only image file should show in colorbox-widget, for non image can open in new tab, or etc
Because some user who use, is thinking all file type must show in colorbox-widget, and if colorbox-widget not show preview of the file, user says the file is not exist