You need to install packages:

  • kmod-sdhci-mt7620
  • block-mount

And depending on the file system of the card:

  • kmod-fs-exfat
  • kmod-fs-ext4
  • kmod-fs-ntfs
  • kmod-fs-vfat

For SMB:
luci-app-samba
samba4-server

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