Hey there Usersince2003,
Thanks for reaching out to the Apple Support Communities. To get started, can you let us know which iPhone and iOS version you're working with? Also, do you know if the photos you're receiving are in the HEIF (High Efficiency Image File Format) format?
We ask because while photos in this format should automatically be shared in a more compatible format that your device can view; however, this would depend on whether your device supports the newer media format.
Check out this link of more details: Using HEIF or HEVC media on Apple devices - Apple Support
Sharing and converting this media
If sharing this media via iCloud Photos, the media is preserved in its original format, resolution, and frame rate. If your device can't fully view, edit, or duplicate HEIF or HEVC media in iCloud Photos, or displays it at a lower resolution, upgrade to iOS 11 or later or macOS High Sierra or later.
If sharing this media using other methods, such as AirDrop, Messages, or email, the media might automatically be shared in a more compatible format, such as JPEG or H.264, depending on whether the receiving device supports the newer media format.
To convert HEIF and HEVC media manually, export it to a different format from an Apple or third-party app. For example:
- If you open an HEIF image in Photos or Preview on your Mac, you can choose File > Export, then choose a format such as JPEG or PNG before saving.
- If you open an HEVC video in QuickTime Player on your Mac, you can choose File > Export As, then save to H.264 by making sure the HEVC checkbox isn’t selected.
If you're able to confirm that the photos are in the HEIF format, have the sender try and export the photo as a JPEG or PNG file to see if the issue persists.
Keep us updated on what you find.
Take care!