PWA Dynamic (Progressive Web App) put an "Install" option

I have implemented PWA. I have used PWA Dynamic(Progressive Web App) free plugins. I have uploaded sw.js & manifest.json files at SEO/metatags and followed the other steps mentioned in the doc but on load, it is not showing the install option. How can I achieve this?

[PWA Dynamic (Progressive Web App) Doc] : -
(https://bubble-essential-plugins.bubbleapps.io/version-test/pwa-dynamic?debug_mode=true)
[manifest.json file]: -(https://s3.amazonaws.com/appforest_uf/f1671700504743x161887801097331900/manifest.json)pforest_uf/f1671700795472x444645301043037100/sw.js)
[sw.js file]: -(https://s3.amazonaws.com/appforest_uf/f1671700795472x444645301043037100/sw.js)