This is the 7802nd most frequent Japanese word.
含める
To include; to incorporate.
Here, '含める' is used to signify inclusion, meaning all materials are part of the package.
このパッケージには全ての資料を含めています。
This package includes all materials.
In this case, '含める' indicates incorporating someone into a defined group or category, such as a project team.
彼女をプロジェクトのメンバーに含めることにしました。
We decided to include her as a member of the project.
'含める' here signifies the action of inclusion in a broader process, such as analysis.