Photo setting is most compatible but HEIC won't convert to jpg

I grabbed an iPhone 15 Pro 2 weeks ago, mainly for its camera setup. After shooting some pics and videos, I realised that they don’t play on my 2015 iMac properly and look different than iPhone (as they are in “High Efficiency” mode. I just changed the camera formats to “Most Compatible” and grabbed more pics and videos… to se they stil in HE modes (like HEIF and HEVC). I spent days to fix it to no avail. Then I raised a case with Apple Australia. After 3 days of interrogations with all level of consultants, they could not supply an answer… it still captures only in HE modes whatever setting be chosen. Whereas, with my old and trusty iPhone 8 Plus, it captures HEIF/HEVC with High Efficiency mode and JPEG/h264 files with Most Compatible mode and everyone knows that’s how it’s supposed to be. As a result, all I can do is return it back and get refund; or buy latest Macs so that the videos from iPhone 15 pro can be played.

Same.

I went to Settings --> Camera --> Formats --> and chose "most compatible." Still sending in heic format. I tried restarting the phone. Still sending in heic format AND restarting my phone meant my background image disappeared and I have a black background. Sighs. Apple is trash.

Thanks for this, Ieonie. I guess I misunderstood the way 'most compatible' is supposed to work, I thought it would stop saving pictures in HEIC on my iPhone and revert back to the normal jpg, but as you have clarified above it is only supposed to work when transferring photos (again Apple dropped the ball when making this OS wide change and not explaining these nuances). That being said, I am in the same boat as all the rest of the users on this thread.... even with 'most compatible' set on my iPhone, the downloading process to my PC has become a pain where only some of my pictures get download (I never had this problem before Apple went to HEIC). Sometimes new pics don't even show up/are not recognized or downloaded .... I would like to know how my iPhone determines "....when the system on the PC cannot handle HEIF..." but it seems to be a flaky algorithm. I'm sure Apple can blame it on the PC software but the reality is Apple change their product mid-stream and it does not seem to be fully debugged. They should have given the iPhone users the option to revert back to jpg only photos on their iPhones instead of this command decision to force everyone to use HEIC formats. Very unhappy Apple customer.

Same problem for me. Setting changed and still downloaded as HEIC not JPG (using a PC). This is VERY frustrating - I have 350+ pics to download.

I asked my coworker if this was fixed in 17.3 and he told me that this was actually fixed in the previous update, maybe 17.2. Can anyone else confirm that this issue is resolved?

I have iOS 17.2.1 and per my thread here, it is still not working correctly.

I'm on 17.2.1 and it's definitely not fixed

Exact same issue and when I "Save As" jpg to jpeg on the computer- the image is severely distorted.

Why does the settings say Most Compatible will be saved as jpeg but it saves as jpg?