Ah ha, II should have tried that before. No, disabling firewall made no difference. although before with my ratty firewall I could connect with cellular but not always
Ok so disabling fw made no difference therefore not a firewall issue.
Now On your cell for photos what is the domain name that’s being used? Either it’s using the local ip which won’t work over cell or the domain name isn’t right. If domain name is good then something is up with port forward on the router.