Hi @Jessica_Moseley ,
Why are you using UiPath version 2018.4.6 and not an updated version?
It seems that this version does not even apper within the UiPath Product Lifecycle list: https://www.uipath.com/legal/trust-and-security/legal-support/product-lifecycle
Did you try to run my previous workflow?
It seems that in the past this issue was quite present: Mail save attachments activity do not work - #14 by libork
Do you even have the latest activity packages?
Best regards,
Marius