Hero3 adb push foo.mp4 "Read-only file system"

[bozosTelemetry]

HLT GP v20.0.17

$ adb push GOPR000?.MP4 \
/storage/emulated/0/Android/data/com.harrys.laptimerpro/files/Movies
failed to copy 'GOPR0001.MP4' to 'GOPR0002.MP4': Read-only file system

I can't connect my Hero3 using WiFi? Can connect/control using GoPro app
Videos appear in HLT Video List under Hero3/3+
but they do not download to the phone for overlay

I figured I could use adb and push them, but nope
What's up?