Android unity C++ plugin - reference prototxt file

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plugin

Unity

C++14

Unity2D

I'm building a C++ plugin for a Unity Android app. The plugin is using OpenCV and specifically i need to load a caffe model by using:

cv::dnn::readNetFromCaffe(path to model files)

Problem is, the plugin is a dll file, so what is the appropriate place to put the files?

What I have tried:

putting the files inside the Assets folder or the root directory of the Unity project, as well as create an Assets resource folder in Android and put the model files there.