"Chat with your document" model selection

All, Bedrock KB has a feature "Chat with your document". To use this feature model should be selected as a first step. In my case when i try to select model, selection process never comes back. Second tab on the same screen provides general information, but does not allow selection Does anybody know what models are qualified? it is possible that i have not request access to it Any information would be appreciated That question is specific to "Chat with your document". in case of regular KB i was able to resolve the issue by either getting access to Titan Text G1 - Premier or disabling "response generation"

Thank you YK