Cannot send Attachment to Android Phone

I'm sorry. But there is no setting on the iPhone regarding SMS/MMS, other than the one I told you about. That is all controlled by cellular data and the carrier. Have them make sure that you have the correct carrier file as well as reset your SMS/MMS profile on your account. Is this happening to anyone with an Android that you are sending to, or just one person? Have they checked to ensure their device is working properly?

Check Settings>Messages, make sure that MMS is turned on. Check Settings>Cellular, make sure that cellular data is turned on. If that does not help, then contact your carrier. MMS is a carrier feature, it requires cellular data and an SMS/MMS plan on your account. Except for the settings I described, there are no other settings for SMS/MMS on the iPhone.

I"m glad you were able to get everything straightened out.

What kind of attachment?

What are you using-email, messaging?

What happens when you try?

Then you need to contact your carrier. As I said, SMS/MMS is a carrier feature and they have to troubleshoot it. If you have the settings on like I described, then the carrier has to fix it.