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
Decrypt memory card -  Open the  Settings
Decrypt memory card -  Tap on  General
Decrypt memory card -  Tap on  Lock screen & security
Decrypt memory card -  Tap on  Encryption & credentials
Decrypt memory card -  Tap on  Encrypt SD card
Decrypt memory card -  Choose  Stop encryption
Decrypt memory card -  Tap on  Stop encryptiom
Decrypt memory card -  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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