iCloud Photos Safari "Only Files in JPEG format can be uploaded"
So, Apple more or less forces a change to the HEIC format for photos. Inconvenient, but, okay, it's a superior format. I'll just deal with it. Except, now that I've converted a bunch of images to HEIC, I can't upload them to iCloud Photos via Safari. I get this message with no explanation: "Only Files in JPEG format can be uploaded." What is this? The Dark Ages?
And, just to rant a bit (more), why is it whenever I finally try out one of Apple's cool new features (usually two or more years after introduction), it either doesn't work (crawling with bugs) or it's implemented in restricted form or the interface is like something from Windows? Yeah, I'm exaggerating, but Apple software just seems to (you know the word).
Mac Pro, macOS 10.12