Hi @tobias_w ,
Welcome to Microsoft Q&A Platform. Thank you for the question.
As per Microsoft Documentation, Form Recognizer v3.0 is currently in public preview. And you can leverage the guide to go through it and check the new features and capabilities.
https://learn.microsoft.com/en-us/azure/applied-ai-services/form-recognizer/v3-migration-guide
Regarding Custom connector in Logicapp, please check the MS document to understand how to create and setup it. Hope this would help you.
Regards,
Kamlesh Kumar
BizTalk Techie
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