Step 1: Despite confirmation from Admin, and the message above saying .HEIC files are supported, they are not being accepted via the website photo upload engine.
I’m getting this with a photo I took on an iPhone and tried to upload to the iNaturalist website (albeit via Windows 11 PC), so I’m not sure it’s a WIndows-specific issue.
Kind of interesting tho that I was I think doing this just a couple of days ago without issue.