Why is the USB drive connected to the router displayed in the web interface by some identifier?
Each USB drive and its partition has its own Universally Unique Identifier (UUID).
If the volume label is not set at all or is set incorrectly, the drive will be displayed in the router's web interface by this identifier (for example, 166A4F046A4EDFDB or 125F-2C45), and this is correct behaviour.

To avoid using identifiers (which make it difficult to recognize the connected drive), it is recommended to assign labels to the drive partitions.
You can assign a partition label when partitioning the drive, formatting the partition, or by editing the label in the PC's operating system. Connect the USB drive directly to the computer and rename it using the operating system tools. For example, in Windows 10, launch File Explorer, right-click on the desired drive, click Rename, and specify the volume label.
In our example, the connected USB drive had no volume label and was identified as B25025CF50259ADD in the web interface. But after setting the label to USB-FLASH-32, it will be displayed correctly in the router interface.

You can also set or change the volume label on a USB drive with special utilities for working with hard drive partitions. For example, in the MiniTool Partition Wizard Free programmeили or other similar software designed to work with physical drives (Partition Manager Community Edition; AOMEI Partition Assistant Standard):

In Linux, you can set the label using the GParted disk partition editor.
Önemli
If, after changing the label, the partition is not automatically added to the router settings on the SMB Server page, delete the old partitions previously added to the system and then re-add them.