Downloading and retrieving photos from server using ionic version 4 app

Hello, I’m new to IONIC, can someone please share some link to tutorials or blog about downloading photos from server and saving them in local storage, also retrieving them later from local photos app. thank you

I doubt anyone can help you much if you don’t tell them which backend you’re using

Hi, i’m using ionic version 4.0.0(beta) with Angular5 with NodeJS(v9.8.0) and MySQL as DB.