Direct image sending via Xbox Live messages is not supported—the messaging system is text-only. However, several easy workarounds let you share images with Xbox friends:
To share your own gameplay captures: Press the Share button (Series X|S) or Xbox button → Y (Xbox One) to capture. Screenshots auto-upload to Xbox network (if enabled). View/share via the Xbox app or xboxgamerdvr.com.
No camera? No problem. Your phone is the ultimate image-sharing tool for Xbox.