title: how i can preview files(documents and images) in angular 6?
body: <p>I am using angular 6 and need to preview files which are present in some path. I need to preview any file type like img,doc,pdf,excel etc(All office documents). Is there is any single library which support both or need to use different for the same. 
  Please let me know if i can follow any example or any link </p>
  
  <p>Thanks in advance.</p>