You can send a package transmittal directly from Packages.
Things to note:
Your organization administrator controls who has the ability to transmit a package. If you don’t have permission, you won’t see a Send Package button.
In Packages, select a package from the Package register.
Click Send Package.
Project Administrators can configure the project to:
The second option makes it easier for recipients to see what has changed in a package. Documents in a package that have not changed since the previous Package Transmittal will not be re-transmitted.
This project-wide setting can be configured from Setup > Project Settings > Packages > Transmittal Settings.