On my Samsung J7 Crown, why can I only send a message to 20 of my 647 contacts in a group at a time?

[Android Central Question]

I want to send a message, or better yet, share my new profile with my new phone number in a one-time group send to all my contacts, but when I start in contacts, group, send message, it only registers 20 contacts max. I cannot get it to group send from the contacts share section which is where I would go on my I phone. Can someone please help? I think it would be better to send the contact so people can just click and add, or maybe that doesn't work on Android? Thank you!