Please refer to the following url in Reference Notice: for how to generate icon/img file, you can go to https://favicon.io/favicon-converter/ to generate specific size picture.

Reference:

• https://medium.com/geekculture/how-to-make-a-next-js-app-a-pwa-a5e2b13da548

• https://dev.to/j471n/convert-nextjs-app-to-pwa-3fd