Most likely this is cached ad inventory and nothing to worry about.
I think y’all were right and it was just ad inventory. Thanks so much for your patience and help 
Looked at this topic too. I am new to this and I thought the Corona build would only include assets that were referenced in the code. Not so! Removed redundant assets from the folder and size reduced from 45MB to 7MB
You can use the exclude option in build.settings to explicitly prevent those assets from being included, but honestly, it’s best to keep extra resources, like original PSD files and such in folders outside of your project. The only files we automatically exclude are hidden files (i.e. files and folders whose names start with a period.)
Rob
also note that apk-size is not install-size. the apk is the zipped distribution, the executable thing is the extracted dex files (and native libs). install-size is typically around 2X apk-size, because the apk is retained, tho it varies – add any extracted assets (images, sound, music, video, etc), any expansion files downloaded, any private data created or cached data obtained after running it, etc.