I am receiving pictures and video from androids while on my home wifi, but am unable to send to android. I have an iphone 8, my wife an iphone 6plus.
We are both having the same issue, and it is only outgoing on our home wifi network.
I called WOW, our ISP, and they said they haven't heard of it and did a hard reset on our modem, an Arris SB6141, my phone sent a few pics to android users, but then it reverted to the same problem of not being able to send. We've never had this issue until around the beginning of December and haven't been able to find our way around it. I think I've narrowed it to the modem or Apple Airport Extreme router, but I'm not an expert beyond narrowing the issue.
This becomes a major problem when you have 3 small children and do not live close to their grandparents (who are all android users)

They want pictures and videos that they have grown accustom to that we currently cannot provide!
Thanks in advance!