When I first got the phone, files transferred to the card fine. When I later try to access the files, the phone says they are corrupted. I've visited the Samsung support site where reports of an update may or may not have fixed the issue. There were 59 pages in the forum of people through different carriers having this issue. I feel I've ruled out that it was the card itself as it works just fine with several other devices. I've also formatted the card with the S8. Can anyone help me?