They need to be uploaded using a different format. You'll need to upload the image to another ap to change the file name to gif, png, jpg etc. Lunapic or Paint will work. After doing that, you can import the file to your homestead file manager. These are images generally taken on an iPhone and code is added for orienting the image. This code messes with Sitebuilder. The above suggestion strips that extra code and you read the new image to your page.