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I've noticed that when searching in Chat, it will not find a file if you as "please find x file" but will find it if you just say "x file." What is the best way to prompt for files?
You can try adding the name of the person who shared, medium in which it is shared like chat, email or from Sharepoint, if you remember the date you can mention that too or if it has any keyword like project name or customer name you can add that too. Basically play around the prompts until you are able to get the expected output.