I assume you want to do this for movies (mp4 files). There is a way to do it on a Mac, using the adb command-line program that developers use to debug mobile devices.
On your Mac, copy your movie file to your user folder. For example purposes, lets say it's called myfile.mp4.
Copy adb to your user folder. It is part of the Android SDK Platform Tools:https://developer.android.com/studio/releases/platform-tools
Enable developer mode on your Oculus Go.https://developer.oculus.com/documentation/mobilesdk/latest/concepts/mobile-device-setup-go
Connect the Oculus Go to your Mac with a USB data cable, and put it on so that you can click OK when it prompts you to Allow USB debugging? in the headset.
Having allowed USB debugging, you can take the headset off, but keep it plugged into your Mac.
On your Mac, launch Terminal.
In the Terminal window, run this command:./adb push myfile.mp4 /storage/self/primary/Movies
./adb push myfile.mp4 /storage/self/primary/Movies
It looks like you're new here. If you want to get involved, click one of these buttons!