Persist the images in shared service

I have an angular multi step form and am maintaining the state of the angular application by using a shared service injected in every component of the page.
I will be saving to database once all the steps have been filled. One of the component is where user uploads few photos,
I want to save them in shared service and would like to retrieve them when the user goes back to that page again.
Basically I want to persist the photos in shared service and should be able to retrieve them. Any suggestions please