Animated gif is not animated in my iOS App


Hi, so I’m working on an iOS app, and I need to tweet an animated gif. I’m using the 1.1 version of the REST API.

if (granted) {
            NSArray *accounts = [accountStore accountsWithAccountType:twitterType];
            NSURL *url = [NSURL URLWithString:@""];
            NSDictionary *params = @{@"status" : status};
            SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeTwitter requestMethod:SLRequestMethodPOST URL:url parameters:params];
            [request addMultipartData:image
            [request setAccount:[accounts lastObject]];
            [request performRequestWithHandler:requestHandler];

I give the image as a NSData like this :
NSData *gifData = [NSData dataWithContentsOfFile: [[NSBundle mainBundle] pathForResource: @“image” ofType: @“gif”]];

Do you have an idea of why my gif isn’t animated ?