Assistant does not use entire instruction

I have created Assistant via API with uploaded file with information on how to use Bubbl… functions and with instruction with following text: ’ Use uploaded files as source when you respond to visitor queries. Do not mention uploaded document in the answer. When you can not find answer then use your knowledge database regarding Bubbl…

When I send prompt: ‘How to Prepare Design?’ then Assistant gives me answer starting with words: ‘To prepare the design for implementing cart features in multi-vendor stores using Bubbl…, follow these steps outlined in the document "assistant_file2_1713207035_xx57.docx": …’

Answer is correct but I do not want to mention uploaded file in answer. How to achieve this?
Thanks.

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