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Yes, RUT955 can act as an FTP server. However, there is a need to install some OpenWRT packages, for example: [OpenWrt Wiki] FTP servers. Keep in mind that it is not really recommended to use RUT955 flash memory as a Storage because it will degrade the flash memory lifecycle. Instead of doing this, you can use the USB Tools option to add external storage and point to the FTP Storage as to the USB Flash drive or external drive. Also, USB tools is having an option to set up an SMB Server (Network Shared Storage).
I hope this helps.