Hi @Daniel H 

Lucidchart's mobile apps for iOS and Android are currently designed to primarily support viewing and basic editing of documents.

In contrast, custom extension packages, such as those built using the Lucid Extension API, are generally optimized for the desktop and web versions of Lucidchart.

As a result, while you can create and utilize custom shapes, editor extensions, and other features on the desktop or web versions, these customizations may not be fully supported or available on the mobile apps, limiting their functionality on-the-go.

Also we will wait to hear from other community members / associates to share their insight, on whether they have any alternative solutions or suggestions that may better meet your needs.

Hope this helps - Happy to help further!!
Thank you very much and have a great one!
Warm regards