SAF Mode
This directory is read-only in direct access mode. To gain full access to this folder, try using SAF mode.
Where?

- button
or 
Or, it can be used for output operations only (if custom destination folders are activated in app's settings - Settings: File Encryptor → Encrypted/Decrypted Files Destination).
If you set the destination(s) to "Ask", the following dialog will be displayed for all encryption/decryption tasks:
Or, after pressing the "Encrypt / Decrypt" button, use the following option:

Notes & Limitations
- In general, external SD cards are usually much less reliable (especially some combinations of devices/SD cards) than an internal memory.
- SAF API provides much lower performance than the standard direct file access mode (especially with dirs that contain a lot of files/subdirs).
- Home/Custom directories cannot be set in SAF; however, the last-picked SAF URI is automatically saved: Home Button → Go to Last Picked SAF Dir.
- The wipe feature does not work. If option “Wipe after Encryption” is checked in the app settings, file(s) will be deleted only.