Error when trying to copy files between phone and SD card

I am unable to transfer files from my phone memory to my sd card.

I am also unable to transfer files from my pc to sd card in the phone. I have no issue transferring files from pc to phone memory.

I can view and open files on the sd card and the phone is able to play music and movies stored on the sd card.

Can anyone help me fix this issue?

Thanks!

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