When trying to send large attachments, the following steps should be taken:

1. Make sure your internet bandwidth is strong enough to support the file.
2. If the file you are trying to send is too large, consider compressing or zipping it before sending.
3. Another option is to reduce the size of the attachement.
4. When sending an attachment, be sure that the person receiving it has the necessary software to support it.
5. Consider breaking the large attachment into multiple smaller attachments.