iPad app pre-load user definitions?

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The SageMath app sends the code to a Sagecell server, retrieves the output and presents it in the iPad screen. Hence this app has the same limitations as Sagecell. You can not read a local file (in your computer or iPad), but you can read files accessible in the web via their URL. See https://ask.sagemath.org/question/39295/how-can-sagecell-read-text-file-from-url. See also, for example, https://github.com/fidelbc/sagecell-load and test the loading of the Sage file published there. I get this in my iPad: