How do I reduce my APK to more than 50 Mb?

I built my app on andromo
When you raise the application to Google Play, it appeared to me this letter "You need to reduce your APK file size to 50MB or use APK Expansion Files" , but I do not know how to use APK Expansion Files and I can not minimize the size of the application ....
Please help and sorry for the inconvenience .... Thanks

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