If the photo file format sent from the iPhone is HEIF (.HEIC), it is difficult to view the photos properly on Android device and it is stored in the File tab, not on the Photo tab. Because Android does not support the file format.
If you want to view the received HEIF (.HEIC) format file, you must use other viewer apps that support the HEIF (.HEIC) format or use a file conversion app.
Or, Please ask the sender to resend the photos after turn on the option 'convert HEIC to JPG' in Send Anywhere app.