apk file is huge

I find files in StreamingAssets folder(as shown in the figure) is not compresssed in apk file. I tried all BuildOptions, but It’s not ok. What should I do?

Streaming Assets on android will be assets folder in the final apk. From code you are directly allowed to read from this folder.

However, as the final .apk is a compressed file, you don’t need to worry about this and try to reduce the original file size which can lead to better compression finally.