I checked the docs but did not find it out. Cloude has API as the GPT Assistant? with also the ability to give a set of documents to work with? It seems that y

I checked the docs but did not find it out. Cloude has API as the GPT Assistant? with also the ability to give a set of documents to work with? It seems that you can only send single message, thus not relying on the ability to "learn" from predefined documents.