why is my memory card not showing on my Phone

[luckyboysantoshkr321]

Yesterday when I take out the memory card from my j2 prime .then I plue bother memory card then it doesn't show in my phone .the memory which i taken out from phone that also not showing.plz tell me how can I do such things.

 

[akemojeed8504]

Why the memory card is not showing on phone?