i can confirm. When add an second file... single file works perfect. Same BCM version.
2018/07/11 09:27:43 Erweiterte Mail senden ERR  Execution Phase: Step 0: sendmailext.chl failed with error : Bad attached file
2018/07/11 09:27:43 Erweiterte Mail senden I  Undo Phase: Step 0: sendmailext.chl starting
2018/07/11 09:27:43 Erweiterte Mail senden I  Undo Phase: Step 0: sendmailext.chl ended
Thank you Andre for testing... Now I know how to proceed.
I will be sending in a BMC ticket to have them mark this as a defect as what is says it does and what it does do not match up... Also, I found that the FROM is not passed to the receiving email client... FROM is NULL... I tested this on the simple email step and the from is null on that one too... I am making sure that the issue is not environmental as I am working in a sandbox using a Linux host based Email server...
Thanks again for the quick assist Andre...