Some advanced file managers allow you to link your Google Drive account and copy folders directly as if they were on an SD card.
Pro Tip: If you use this file often, long-press it and select "Move" or "Copy" to send it to the regular Downloads folder so you can find it easier next time.
If you are writing code, you are likely using the (though Google now recommends using the REST API for new projects, as the Play Services API is deprecated).
You don't actually need a file manager to open the file, just to move it.