Given a File, extract the file's content as a base64 encoded data URL. The response will have a prefix that includes the MIME type of the file, e.g. "data:image/jpeg;base64,iVBORw0K......"
Given a File, extract the file's content as a base64 encoded data URL. The response will have a prefix that includes the MIME type of the file, e.g. "data:image/jpeg;base64,iVBORw0K......"