Checking a 'fixed' 32gb sd card

I had an LG K20plus and I put a 32gb sd card in. I formatted correctly. I transferred ALL of my photos and videos. The next day 80% were gone and after returning to the store the card read as corrupted. I just did the 'fix' recommended in these forums and I'm scared to put it back in the phone. I had to purchase a new phone because I believe the sd port was damaged by the sales girl.
I want to put it into the old phone to see if it still reads corrupt. Yea? Nah?

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