Uploading file from local desk to dialog aem 6.4

Hi,

I am tring to upload a image/files from local desk to dialog in aem 6.4, its taking images from local but its not displaying on page

drag and drop images on dialog is working , doing like this images displaying on page also but drag the any file in pdf format is not working .

Can you please help me out what to do for uploading files from local desk not from dam.