WD expansion drive not seen

HI all…I have just purchased a 500GB WD blue sn550 to go into my Median notebook as an expansion drive as I have run out of memory. Not being very tech savvy I took it to a colleague who knows about these things! Apparently the notebook does not even know it has a drive plugged! i have phoned the Medion helpline who weren’t very helpful. She didn’t sound that knowledgeable and ended up telling me I may need drivers for the WD drive. Is that right??