I was doing the photo sharing with my H, but I was the one initiate if. And to be honest, I did it because I was thinking of him, I wanted him to share these moments with me. So maybe your w is the same. You are right of being a long distance H. You can have boundaries if it's not working for you. I am still learning to detach, and I learned that texting back and forth really was not helping, even it's only about children. My opinion will be ask nicely but firmly. If she got upset, don't let her drag you into an argument. Try to think of what she might say and prepare some non reactive responses. I would say these texts are part of her cake eating attempt. Separation with children is hard. I have to make excuses for H to not come over so regularly so I can keep sane... good luck!
Me: 33 H: 32 T: 10 years M: 2 BD: Aug 2016 H moved out Aug 20, 2016 S: 17 months old