This module will give you a new path to your external sdcard storage with all necessary R/W access permissions.
The new access path for your external SDCard: /mnt/media_rw/SDCARDNUMBER/
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A little note: if with this module you get access permissions issues, just install the ZIP version with SELinux toggler on the XDA thread.
Download ExSDCard Write Access Enabler Magisk Module
You can get the latest version of ExSDCard Write Access Enabler by clicking the below link: