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Because it's a network share. A locally connected USB drive is a local drive. Calibre tends to only "see" local drives (USB Mass Storage, IDE, SCSI, SATA), not networked "shares". An ereader or gadget using USB Networking also seems invisible). USB MTP are best accessed as a Device that's not mounted to the File Manager, not Calibre to Filesystem, but a thumb drive is likely USB Mass Storage.
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