How to "copy" item list from other flow / selected attachments

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Hi Paweł,
You should be able to solve both topics without need to use API.

Part 1.
You could solve it in few ways:
1. If you've already created an action, you could make it visible on top menu button, and execute it using INVOKE MENU ACTION function on change of field containing ID of source document (it is a built in function).
2. Configure initialization* on the list, and use INITIALIZE form rule on change of field containing ID of source document (it is a built in function).

* https://docs.webcon.com/docs/2023R3/Studio/Process/Attribute/Basic/Itemlist/ILConf/ILConf_Init/#2-initialization

Part 2.
You should be able to use standard Add attachment* action, as you are adding from other documents, to current one. It's harder the other way.

* https://docs.webcon.com/docs/2023R3/Studio/Action/Attachments/Action_AddAttachment