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µC/FTP uses the API's defined by µC/TCP-IP Network File System Abstraction Layer (net_fs.h) to access the file system. It is possible to use µC/FTPs with other file systems by providing an appropriate implementation of the µC/TCP-IP Network File System Abstraction Layer. Example template files to port the file system are available in the µC/TCP-IP Network File System Abstraction Layer directory.
Obviously µC/FTPs requires a file system for reading and writing files. We suggest using a conventional File system implementation such as µC/FS. This will allow you to dynamically load files and enable your server to receive files.