How to send a photo as a JPEG from my iPhone 8?

If you have set the camera settings to "most compatible" under Settings->Camera->Formats it should be taking pictures in JPEG format already.

If you have it set to High Efficiency it will take them as HEIC but should convert them to JPEG automatically when you email them.

cmcm ~ Apple's Shortcuts app can convert a photo to JPEG and then share it. Below is just a quick example of a custom shortcut — if you want it to be more sophisticated / more instructions, post back here.

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cmcm_22 wrote:

I guess this is an iphone 6

Your footer here shows an iPhone 6s running iOS 15.

An iPhone 6 cannot get to iOS 15. Only iPhone 6s and later.

If you’re not sure what iPhone and which iOS you have, see Settings > General > About.

Oldest iPhone camera and processor with HEIF support is iPhone 7.

If you’re on an iPhone older than iPhone 7, it’s all JPEG captures, all the time.

On iPhone 7 and later, Settings > Camera > Formats set to High Efficiency uses HEIC, while set most compatible uses JPEG.

Details: Introducing HEIF and HEVC - WWDC17 - Videos - Apple Developer

An iPhone 6 takes pictures in jpeg format, so no settings to change. Just email the picture and it will already be in jpeg format.

Nothing to do.