Appsheet: can't figure out how to work with start expressions and related tables

[Conceito]

Hi there,

I'm quite new to Appsheets, starting to implement it in my company.

I didn't find a tutorial or page where I could really understand how to work with Start expressions and with Select, mostly because I need to show a related table value in a pdf template for a report.

This should show tables with Status, descriptions and images (table 3) for each Category (table 2).

Below there is all the tables' types and names, if this help somehow.

And I didn't get there yet because I need this to work first so I can find out, but the Images column shall show the picture, not only the value.

Hope someone can help me out with this.