Use the following tips for help with pipeline management:

I assigned my sample pipeline the templates label, but the pipeline is not listed as a user-defined sample
In addition to assigning the label templates to a pipeline, you must publish the pipeline and grant users permission to read the pipeline before they can use the pipeline as a sample pipeline.
For more information, see Creating User-Defined Sample Pipelines.
When selecting the authoring engine for my pipeline, the engine that I want to select is not listed.

The authoring engine selection window displays engines that you have read permission on. Contact your organization administrator to verify that you have read permission on all engines that you need to access.

For more information, see Permissions.

The authoring engine selected for my pipeline is not accessible.
Verify that the engine is running, that the engine can communicate with Control Hub, and that the web browser can reach the engine.
For more information, see Accessible Engines.
When I publish or export a pipeline, the action fails with a "Packet for query is too large" error.
If a pipeline preview contains a large amount of data and the preview record schema is saved in the pipeline configuration, then the pipeline configuration can reach an excessive size. This in turn can cause a publish or export of the pipeline to fail.
To resolve this issue, delete the saved schema from the pipeline. Open the pipeline in the canvas, select a stage, and then click the Schema tab in the pipeline properties panel. At the top of the pipeline properties panel, click Delete Schema.
Then publish or export the pipeline again.
For more information about previewing pipelines, see the Data Collector documentation or the Transformer documentation.