mount android resources

[BKnova]

If this is a silly question, please forgive me.
Main purpose: I want NextCloudPi to use an external USB hard drive connected to an Android phone. Can Pi Deploy mount an external hard drive? Is this possible?
Device info: Redmi Note 9T; MIUI Global 14.
I tried using the "lsblk" command in the openssh to find the USB path, but the "MOUNTPOINTS" column does not show any information. and I navigated to mnt/media_rw/ ,but can't find anything.
I'm stuck. Could someone with experience please help me?

8791-D3D9 is my target external USB path in android,
and"7C16F5C816F58404" is Pi Deploy default folder

mount's setting of Pi Deploy
probably,my mount's setting is wronged.

Lastly, I would like to say a big thank you to the developers who contributed to Pi-hole-for-Android. Even though I'm not familiar with Raspberry Pi and Linux, I can still enjoy the fun and convenience they bring.