Consider replacing the microSD card with a new one that is compatible with your HTC U12/U12 Plus if none of the prior methods helps and none of your other devices is able to read the same SD card too.

Here’s how to reformat an SD card on your Samsung A8 2018: Open the Apps screen. Tap Settings. Go to Storage. Scroll down and tap the option to Format SD card.

If SD or MMC Memory Card Reader, Drive or Slot is not working or recognized, not detected or cannot be read in Windows 11/10, see this post.

The SD card reader slot on the new 14 and 16-inch MacBook Pro models is not functioning as expected with some SD cards, according to multiple reports on the MacRumors forums. Same issues with 14 ...

This post provides guidance on how to fix the USB drive or SD card Unallocated Space error that you might encounter in Windows 11/10.