"Hello, I am building an agent using Botpress Viber, on the free Pay as you go plan. My use case requires the agent to read text content from PDFs and images attached by users during the conversation, for example payslips to analyze. I understand this feature is called Vision Agent and is configured through the Autonomous Node in Botpress Studio, but I cannot find a way to access the Studio view from my agent created in Viber. Could you tell me how to enable this feature, and whether it is available on the free plan or requires an upgrade?"