I used

mount -t ext4 /dev/mmcblk1p1 /storage/emulated/0/mounted_dir
chmod 0777 /storage/emulated/0/mounted_dir

(chmod is to ensure the folder is visible in the entire phone)to mount my ext4 formatted sd card. However, it's files are not visible in the file explorer, and also not visible when accessed through ls -l /storage/emulated/0/mounted_dir. However, when I run ls /storage/emulated/0/mounted_dir, the files are shown.

How do I fix this such that the file explorer app can view the folder?

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