Drag and Drop Files into Tasks
Add images, PDFs etc. to a task via drag and drop and display a 16:9 thumbnail, just like in Wunderlist. So a user can see add a glance, which images are appended.
Dima Diall commented
Agreed, adding files from email attachments and other situations is painful without drag & drop support... also a thumbnail would be very helpful for most files but actually *critical* for images.