To the ones using this tutorial: If you the option to install your app doesn't show up, go to your Chrome Developer Tools, Application tab, in the top left corner under "Application" Manifest.
There, on the top under "Install" all the problems with your app that prevent it from being installed will be listed. If the "Install" section doesn't show up for you, then you're you should be all set to go and install your PWA :D
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To the ones using this tutorial: If you the option to install your app doesn't show up, go to your Chrome Developer Tools, Application tab, in the top left corner under "Application" Manifest.
There, on the top under "Install" all the problems with your app that prevent it from being installed will be listed. If the "Install" section doesn't show up for you, then you're you should be all set to go and install your PWA :D