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Postman and Postman Flows are simply brilliant technology. It has some foibles, some minor bugs, and some of the workflow and UI/UX could be improved, but ultimately, it's just awesome.
This zone collects some useful links about Postman and Postman Flows, and records some tips, some current issues, and some workarounds.
Use of Postman Flows – patch-based wiring of Requests, including the ability to reuse Flows as sub-patches using the Flow Module block – is very powerful and useful. It's a different mindset than just using direct Requests and opens up a world of testing capabilities. The free trial account only gives access to 5 Flow. It's a no brainer; upgrade to one of the paid accounts and start using Flows on your project.
The Flow Query Language (FQL) of Postman is a wonder to behold! It makes it brilliantly easy to navigate responses (in JSON or XM)L to select specific data or specific lists of data (with or without keys), and works together with the JSON or XML aware path system of Postman.
FQL can be used in an Evaluate block of a Postman Flow, and is often a better option than using TypeScript. Where an (otherwise already powerful) Select block is not enough, consider using an Evaluate block.
Make sure you become familiar (from the get-go) with the FQL function reference, it may save you a lot of time.