Include source file in DS 2020

Hello,

I am using Arm DS IDE 2020. I am trying to write an assembly code to be downloaded on a board. In my assembly program file, I am including a file as:

INCLUDE startup_stm32l476xx.s

and this file is already in the project directory. But when I try to build the project I get an error that the file could not be opened: No such file or directory. Is there a specific way to make the project aware of the included files? 

Thanks

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