Here’s a quick tip if you are struggling to upload a photo from your iPhone to other web services. Many advertising websites don't recognise the format ‘HEIC’ – including eBay, Amazon & Facebook. So, when trying to do an advert or just post something new and upload your photos, it won’t accept your images. 

Here's maybe why. If your photos are suddenly showing an extension at the end of their file name ‘...HEIC format’ then this will most likely be the reason. These settings are changed in the iPhone, not the Mac or its system OSX. It bears no relevance to Airdrop or how you are transferring or uploading these files. It is the camera option on the phone. When you update or get a new iPhone the Camera setting default to High Efficiency – in order format images for upload to the likes of eBay the setting should be changed to Most Compatible.

If you’re not seeing an extension to the end of your files like .JPEG or .PNG go into Finder, select Preferences, Click on Advanced and make sure ‘show all filename extensions’ is ticked.