To use an encrypted memory card in another device, it must be decrypted on the device on which the SD card was encrypted.

Android 9 (LG UX 9.0)
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Lock screen & security
Step 4:  Tap on  Encryption & credentials
Step 5:  Tap on  Encrypt SD card
Step 6:  Choose  Stop encryption
Step 7:  Tap on  Stop encryptiom
Step 8:  Enter  Password / PIN / Pattern
  1. Open the Settings
  2. Tap on General
  3. Tap on Lock screen & security
  4. Tap on Encryption & credentials
  5. Tap on Encrypt SD card
  6. Choose Stop encryption
  7. Tap on Stop encryptiom
  8. Enter Password/PIN/Pattern

LG Instructions
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