I'm not looking for trouble. I'm a news photographer and looking for a photo. This is my job (freelance, self-employed). I will certainly take pictures of the protest on the ground with my Canon, but showing the detention center in the background...
I have no experience with a Mini 4 Pro so someone will be along shortly to advise.
I have flown in ATTI mode successfully and safely many times over the past 15 years with only one problem. It's if the drone switches between modes when flying...
On a Mini4P Atti is only a mode that it goes into when GPS signal doesn't meet minimum requirements - AFAIK it is not manually selectable using the regular controller / software.
However that should not cause you great problems flying indoors IF...
You didn't mention whether you managed to get any kind of satellite reception during the test flight. If you did: it's likely to have been sporadic and have dropped out at times - that's when ATTI mode kicks in and your drone gets squirrelly...
Delivered this morning, took right at a week ordered from South Korea. Creator Combo, $3799 out the door after tax, free shipping, and no customs additional charges! Boom!!
That was the cheapest price I saw during a month of daily ebay searches...