# Assembly Pipeline Foundations

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There are a number of workflow tools, file systems, and libraries that are key to understanding in order to build successful assembly pipelines using Octane and the Render Network.

#### **OCS vs ORBX**

* OCS: Saves the current layout (.ocs file), ideal for saving the master scene.
* ORBX: Stores encapsulated objects (.orbx), ideal for asset libraries and importing.

#### Differential Upload

When preparing jobs for the Render Network using **Render Network Manager**, scenes are uploaded incrementally:

* Only new or changed assets are re-uploaded
* File trees and XRefs are respected
* Saves time and bandwidth<br>

For more comprehensive information about using **Differential Uploading** on the Render Network, please refer to the guide below.

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