Your comments

HI there
For me ,i usually process the image using an Online Image Tutorial Gallery which provide comprehensive sample codes and detailed tutorials for any image processing issue.It helps a lot.
Hi there
I agree with Marcus,i don't think image, video, audio or PDF preview should be automatic.If there is a powerful tool which supports to do that ,i'd like to have a try.
HI there
If you want to zoom in or out ,you'd better add an web page zoom section.It supports to zoom image or page effectively.And it would be more convenient for you.Best wishes.
HI there
If you want to view the pdf files,you'd better add a pdf viewer which supports to view pdf files directly.There are many third party program.You can have a try