Go back to Finder and locate the file you want to transfer to Android. Right-click that file and click Share. From the Share ...

Duet Display lets you use any Android device as a second screen for your Mac, whether wired or wireless, giving you extra space for multitasking.

Easily copy and paste text between your Android phone and Mac using KDE Connect and Soduto, with seamless clipboard sync over the same Wi-Fi network.

Google is apparently working on better integrating Android with iOS and macOS. Quick Share is to be used for this.