Combine file and message into one llm call?

[jolly karma]

Currently the openclaw act as this:
User: <file>
User: please summarize this file
Claw: (Quoting the file) How can I help you
Claw: (Quoting "please summarize this file") The file summary is blahblah...

The first message claw sent is useless. Is there any way for it to act like an llm web interface which there is only a single llm call. The message is sent directly to llm and the file is attached as an attachment.
The ideal scenario is like:
User: <file>
User: please summarize this file
Claw: (Quoting "please summarize this file") The file summary is blahblah...

[unique bough]

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[jolly karma]

Was thinking about some slash commands like
User: /combine
User: <file>
User: please summarize this file
User: /end_combine
Claw: blah blah...