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When you will install the plugins by Ionic you are using the flag --save? Another thing that may be happening is a plugin not being available in the version of your platform. For example, in config.xml I was using version 6.1.2 of android, and in the camera plugin, he said that the plugin only worked in versions > 6.3.0.
I had to update the version of my android: Ionic Cordova Platform upgrade [email protected]
Note: @ after android was to specify the version I wanted to install.