Hi all, i am a relative newbie.
i have an iphone 10, recently when i switch from picture mode to video mode on my phone control it doesnt switch to a red button to alllow me to take video.
i am on ios13 beta 2 for iphone
I just updated firmware.
This just happened on july 9 as video was working on july 8.

I am not flying in gesture mode, just starting up normal.
it has a sd card inserted in spark.

I am at a loss for what is going on

I have an Iphone too and this has also happened to me, although Im not saying it's an iphone related issue. First time, I read that clearing the cache in the DJI go 4 app would fix it. So I did that and sure if enough it worked. But then just yesterday I thought it was doing it again. I'd press the button on the phone screen to change it over to video and it would just take a picture. I pressed and held it for a long second or two and it switched over and started working fine.

Had a similar problem a year ago with "Sylvester" the spark. There's a setting about automatically clearing cache. Turn that on. I think I have it turned on with Phoebe too.