Hi Barry,
If you have photos made with an iPhone you have to convert them to JPG first. I do that by storing the photos (from Photos) in Files called in a map called JPG. In that map click on the photo to convert, then Quick actions, Convert, choose JPG and choose the size (Small, Medium, Large)
This JPG photo can be uploaded to the website. Took me sometime to find this out 😉
Alternative: send them to
d.bakkeren@gmail.com