File download is not working from FTP using URL session in iOS

Using URL session FTP download is not working. I tried using below code.

Approach 1:

 NSURL *url_upload = [NSURL URLWithString:@"ftp://user:pwd@121.122.0.200:/usr/path/file.json"];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url_upload];
    [request setHTTPMethod:@"PUT"];
    
    NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSURL *docsDirURL = [NSURL fileURLWithPath:[docsDir stringByAppendingPathComponent:@"prova.zip"]];
    
    NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
    sessionConfig.timeoutIntervalForRequest = 30.0;
    sessionConfig.timeoutIntervalForResource = 60.0;
    sessionConfig.allowsCellularAccess = YES;
    sessionConfig.HTTPMaximumConnectionsPerHost = 1;
    NSURLSession *upLoadSession = [NSURLSession sessionWithConfiguration:sessionConfig delegate:self delegateQueue:nil];
    NSURLSessionUploadTask *uploadTask = [upLoadSession uploadTaskWithRequest:request fromFile:docsDirURL];
    [uploadTask resume];

Approach 2:

NSURL *url = [NSURL URLWithString:@"ftp://121.122.0.200:/usr/path/file.json"];
NSString * utente = @"raseen";
NSString * codice = @"raseen";
NSURLProtectionSpace * protectionSpace = [[NSURLProtectionSpace alloc] initWithHost:url.host port:[url.port integerValue] protocol:url.scheme realm:nil authenticationMethod:nil];

NSURLCredential *cred = [NSURLCredential
                         credentialWithUser:utente
                         password:codice
                         persistence:NSURLCredentialPersistenceForSession];


NSURLCredentialStorage * cred_storage ;
[cred_storage setCredential:cred forProtectionSpace:protectionSpace];

NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
sessionConfiguration.URLCredentialStorage = cred_storage;
sessionConfiguration.allowsCellularAccess = YES;

NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration delegate:self delegateQueue:nil];

NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithURL:url];
[downloadTask resume];

Error getting :

the requested url is not found on this server

But the same url is working in terminal with SCP command and file is downloading successfully