SD Card Problems!?

[AC Question]

I bought a Samsung Galaxy J5 yesterday, and I've already filled the internal storage with music, photos and apps, so I found an old SD card around the house (Samsung 8GB MicroSD) and put it in, but it says it's blank and may contain an unsupported file? If I click on the notification it says erasing SD Card, I don't mind that it's being wiped, but it doesn't do anything after? I'll then go into settings and into storage to click "mount SD" but it says "Please Insert A Sim Card" whilst I have a notification saying "Sim Card Safe to Remove"

Please help?!

 

[sydneycooper1979]

Is there an option to format it? If not, you may just need to get a new sd card