The "file-transfer" plugin was deprecated at some stage, but we were informed by the customer who successfully built a native app that the plugin was updated and was no longer deprecated. This is what he wrote about a month ago:
"The “cordova-plugin-file-transfer” plugin was updated five days ago and it is now working with Monaca’s IOS debug and release builds. I reinstated the plugin in our iOS app and the camera functionality is now working the same as before.
Our app was approved by Apple today, the app included the plugin so I assume that Apple are still allowing developers to use it.
This is the plugin’s GitHub link that shows the recent update: https://github.com/apache/cordova-plugin-file-transfer"
This plugin is required if you use a mobile camera in your app. Otherwise you can remove it from the config.xml file
