Apple Logic Pro X - Manual (Page 912)

Chapter 25 Preferences, project settings, and key commands 912
Assets settings
Assets settings are only available when Show Advanced Tools is selected in
Advanced preferences.
The project assets refer to all audio files, EXS instruments, and other data associated with the
project. Ideally, you should save all project assets with the project file, but on certain occasions
you may prefer not to.
You can choose to copy the following assets into the project package: