why my 950 xl dual sim do not detecting any sd card?

i have 950 xl dual sim, i have 2 micro sd cards of san disk, both are working good in my old cell phone but when i put them into my 950 xl , it not working,
i can see the the message there are not any readable items..

i downloaded some videos in my phone but i can not play them even though i have cc player and vlc player in my phone...

can u please help me ...

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