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We allow any customer or partner to add own actions via our SDK from 5.6.0. We also have a public example on how to do that using our SDK (https://github.com/Digizuite/integration-api-examples/tree/main/AWExternalAction ) and documentation is also here DC 5.6 API & SDK - Register external action in AW (webhook)
It comes out-of-box with your Media Manager:
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