Was tearing my hair out bc video wasn't toggling on the iphone contoller and it was indicating no SD card (even tho mutiple were tried).
Helpful chat support instructed me to reinatall the DJ4 app and now everything is working perfectly.

Hopefully you find this if you were having the ssame issues as me bc it will save you mucho time and frustration.

Love this little device BUT I am only getting about 10 mins of flying time max.

Cheers,

Toni

I  had the same issue. Resinstall app and all good.