My Mac mail won't send photo attachments
When I compose an email in iMac Mail and attach a photo, it appears to send as normal and shows up in my sent folder. But my recipients never receive the attached JPEG photo. Sometimes they might see an icon (as below), which looks like the photo is there, but it doesn't open. I have tried to turning on and off the privacy settings which didn't help, and not sure what else to do. Is there a simple setting that I am missing? I am running Ventura 13.6.3.
iMac Pro (2017)