The uploader component allows to create preview images before uploaded it. The preview images created by reading the file using selected event. Also, the user can create preview images after uploading to server using success event. Refer to the following link to learn about how to create image preview.
You can also explore Angular File Upload feature tour page for its groundbreaking features. You can also explore our Angular File Upload example to understand how to browse the files which you want to upload to the server.