Hello, I have a new Samsung J3 2017 that I'm using as a spare to see if I like a full version flagship Samsung smartphone. I can't not get it, J3, to send picture messages via my home wi-fi. Only text will go through on wi-fi. Picture messages and text will only send thru my provider data connection. They will not send to any contacts thru my wi-fi nor will it send to my HTC M9 phone. They attempt but the small mms/sms prompt next to photo continues to spin and it never sends. I even lowered my picture size on these sends thinking it may be to large to accommodate. I normally do everything; messaging and email through wi-fi on my phones and save the data for emergency. My wi-fi works fine with internet and email sends on this Samsung J3 (and good wi-fi on all other devices). What toggle am I missing on this J3 to use wi-fi for multi-messaging? I have only attempted one photo send at a time with no success. Thank you.