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Building a UML component diagram and want to add a port symbol as described in https://www.lucidchart.com/pages/uml-component-diagram#section_3 but I cannot find it in the UML section. Is there another add-on I am missing?

Hi 

Thank you for posting in the Community! My apologies for the confusion as that specific shape does not exist in our UML shape libraries. However you can drag out a standard square shape add a line to the shape and then add the new shape to a custom shape library.

After creating the shape right-click and select "Add to Custom Shape Library". You can then add the library to your document by selecting "+ Shape Library" and the shape library will be located under the "My Libraries" dropdown. 

Again my apologies for the confusion. Please let me know if you have any other questions!