Review on Amplim 32GB Micro SD Card 4 Pack with Adapter - Class 10 UHS-I U1 V10 High Speed Memory for Nintendo Switch, GoPro, Galaxy Phone, Camera and More by Mario Newton

The maps worked fine when they were in my phone but as soon as I took them out they were no longer readable or recognizable by any device. The first card, which I thought was a miss, happened on both cards though. Other cards from other manufacturers work fine on my device and in the adapter that came with it, so the problem seems to be that these cards don't work.