iOS BGProcessingTask File AWS S3 Add Limits

I’ve BGProcessingTask & BGAppRefreshTask working effective. The principle objective of my use of BGProcessingTask is to add a file to AWS S3 utilizing multipart/form-data. I’ve discovered that any file above about 2.5MB instances out after operating nearly 4 minutes. If I run the identical RESTful api utilizing curl or Postman, I can add a 25MB file in 3 seconds or much less.

I’ve tried to intentionally set .earliestBeginDate to 01:00 or 02:00 native time on the iPhone, however that doesn’t appear to assist.

I exploit the delegate (sure, I’m writing in Goal C) – URLSession:job:didSendBodyData:totalBytesSent:totalBytesExpectedToSend: and discover that the iOS system uploads about 140kB each 15 seconds or so.

I’m on the lookout for suggestions or perception into how I would allow uploads of 25MB recordsdata. I’d be comfortable it I might do only one a day for my use case.

I present code on how I arrange the NSURLSession and NSURLSessionDownloadTask, as it’s my guess that if there’s something that must be modified it’s there.
I’ve to imagine there’s a resolution for this since I learn in lots of posts right here and in Apple Developer how builders are utilizing this performance for importing many, many recordsdata.

NSURLSessionConfiguration *sConf            =   [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:bkto.taskIdentifier];
    sConf.URLCache                          =   [NSURLCache sharedURLCache];
    sConf.waitsForConnectivity              =   YES;
    sConf.allowsCellularAccess              =   NO;
    sConf.networkServiceType                =   NSURLNetworkServiceTypeVideot;
    sConf.multipathServiceType              =   NSURLSessionMultipathServiceTypeNone;
    sConf.discretionary                     =   YES;
    sConf.timeoutIntervalForResource        =   kONEHOURINTERVAL;
    sConf.timeoutIntervalForRequest         =   kONEMINUTEINTERVAL;
    sConf.allowsExpensiveNetworkAccess      =   NO ;
    sConf.allowsConstrainedNetworkAccess    =   NO;
    sConf.sessionSendsLaunchEvents          =   YES;
    myURLSession = [NSURLSession sessionWithConfiguration:sConf delegate:self delegateQueue:nil];

and later

NSMutableURLRequest *request        =   [NSMutableURLRequest requestWithURL:[NSURL URLWithString:pth]];
    request.HTTPMethod              =   kHTTPPOST;
    request.HTTPBody                =   [NSData my body data];
    request.timeoutInterval         =   60;                                                                             
    [request setValue:@"*/*" forHTTPHeaderField:@"Accept"];
    [request setValue:@"en-us,en" forHTTPHeaderField:@"Accept-Language"];
    [request setValue:@"gzip, deflate, br" forHTTPHeaderField:@"Accept-Encoding"];
    [request setValue:@"ISO-8859-1,utf-8" forHTTPHeaderField:@"Accept-Charset"];
    [request setValue:@"600" forHTTPHeaderField:@"Keep-Alive"];                                                                 
    [request setValue:@"keep-alive" forHTTPHeaderField:@"Connection"];
    NSString *contType              =   [NSString stringWithFormat:@"multipart/form-data; boundary=%@",bnd];
    [request setValue:contType forHTTPHeaderField:@"Content-Type"];
    [request addValue:[NSString stringWithFormat:@"%lu",(unsigned long)myData.length] forHTTPHeaderField:@"Content material-Size"];

    NSURLSessionDownloadTask *downloadTask          =   [myURLSession downloadTaskWithRequest:request];
    downloadTask.countOfBytesClientExpectsToSend    =   bd.size + 500;
    downloadTask.countOfBytesClientExpectsToReceive =   5000;
    NSLog(@"%s: downloadTask = %@,  time  %@",__FUNCTION__,downloadTask,[NSDate date]);
    [downloadTask resume];

and listed here are logs exhibiting the rare uploads of small information chunks:

-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: job = BackgroundDownloadTask <76A81A80-4703-4686-8742-A0048EB65108>.<2>, time  Fri Mar  7 16:25:21 2025
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: bytesSent = 393,216
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: totalBytesSent = 393,216
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: job = BackgroundDownloadTask <76A81A80-4703-4686-8742-A0048EB65108>.<2>, time  Fri Mar  7 16:25:27 2025
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: bytesSent = 131,072
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: totalBytesSent = 524,288
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: job = BackgroundDownloadTask <76A81A80-4703-4686-8742-A0048EB65108>.<2>, time  Fri Mar  7 16:25:42 2025
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: bytesSent = 131,072
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: totalBytesSent = 655,360
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: job = BackgroundDownloadTask <76A81A80-4703-4686-8742-A0048EB65108>.<2>, time  Fri Mar  7 16:25:56 2025
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: bytesSent = 131,072
-[BKSessionManager URLSession:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:]: totalBytesSent = 786,432