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Help me understand the BI Engine reasons

Hi there,

I have started using BI engine for one of the projects and when i ran a query recently i noticed that it did not utilize the BI engine and instead it's showing this message - " Cannot broadcast table X: number of files 100 > supported limit of 20."
The query contains a left join to table X.

I am on a flat-rate pricing with a reservation of 10GB. i did not specify any preferred tables.

 

Could someone please explain me the reason in a bit more detail and what i can do to make my query utilize the BI engine?

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