Hey everyone. Hope you all are well. I am working on integrating saving media to camera roll functionality into a social media app similar to how Twitter/X does it. I already got image saving and GIF saving down via PHPhotoLibrary, but I am having trouble doing the same for video saving. Whenever I do a similar implementation for it, I get error messages relating to converting the format of the video (the format is avc1) to mp4 as I originally was getting error codes saying the original format isn't supported. I tried to work around it by coding a converter to convert the video to mp4 format before saving as seen below:

extension PostViewModel {
    func getPostType(post: PostOBJ) -> PostType {
        return .none
    }

    func videoFormatConverter(videoURL: URL, completion: @escaping (URL?, Error?) -> Void) {
        let asset = AVAsset(url: videoURL)

        guard let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality) else {
            completion(nil, NSError(domain: "", code: 500, userInfo: [NSLocalizedDescriptionKey: "Failed to create export session"]))
            return
        }

        let outputURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("convertedVideo.mp4")

        exportSession.outputFileType = .mp4
        exportSession.outputURL = outputURL

        exportSession.exportAsynchronously {
            switch exportSession.status {
            case .completed:
                print("Successfully converted video to MP4 format.")
                completion(outputURL, nil)
            case .failed:
                completion(nil, exportSession.error ?? NSError(domain: "", code: 500, userInfo: [NSLocalizedDescriptionKey: "Unknown error occurred"]))
            case .cancelled:
                completion(nil, NSError(domain: "", code: 500, userInfo: [NSLocalizedDescriptionKey: "Export cancelled"]))
            default:
                completion(nil, NSError(domain: "", code: 500, userInfo: [NSLocalizedDescriptionKey: "Unknown error occurred"]))
            }
        }
    }

    func getVideoFormat(forURL url: URL) -> String? {
        let asset = AVURLAsset(url: url)

        guard let track = asset.tracks(withMediaType: .video).first else {
            return nil
        }

        let formatDescription = track.formatDescriptions.first
        guard let description = formatDescription else {
            return nil
        }

        let formatFourCC = CMFormatDescriptionGetMediaSubType(description as! CMFormatDescription)
        let formatString = String(format: "%c%c%c%c",
                                  (formatFourCC >> 24) & 0xff,
                                  (formatFourCC >> 16) & 0xff,
                                  (formatFourCC >> 8) & 0xff,
                                  formatFourCC & 0xff)

        return formatString
    }
}

After converting the video to the intended format, it's supposed to save the video to the camera roll via PHPhotoLibrary as seen below:

.contextMenu {
                        Button(action: {
                            guard let videoURL = URL(string: media.link.absoluteString) else {
                                print("Error fetching video url.")
                                return
                            }

                            if let format = viewModel.getVideoFormat(forURL: videoURL) {
                                print("Video format: \(format)")
                            }

                            viewModel.videoFormatConverter(videoURL: videoURL) { convertedURL, error in
                                if let convertedURL = convertedURL {
                                    PHPhotoLibrary.shared().performChanges({
                                        PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: convertedURL)
                                    }){ success, error in
                                        if success{
                                            print("Video saved to camera roll!")
                                        } else {
                                            debugPrint("Error:\(String(describing: error))")
                                            print("Error when saving video:\(error?.localizedDescription ?? "Unknown error")")
                                        }
                                    }
                                } else {
                                    debugPrint("Error: \(String(describing: error))")
                                    print("Error when converting video format: \(error?.localizedDescription ?? "Unknown error")")
                                }
                            }
                        }) {
                            Text("Save Video")
                            Image(systemName: "square.and.arrow.down")
                        }

                        ShareLink(item: viewModel.post.url) {
                            Text("Share via ...")
                            Image(systemName: "square.and.arrow.up")
                        }
                    }

When I attempt to perform the intended operation, I get these error codes:

"Error: Optional(Error Domain=AVFoundationErrorDomain Code=-11838 \"Operation Stopped\" UserInfo={NSLocalizedFailureReason=The operation is not supported for this media., NSLocalizedDescription=Operation Stopped, NSUnderlyingError=0x280d339c0 {Error Domain=NSOSStatusErrorDomain Code=-12109 \"(null)\"}})"
Error when converting video format: Operation Stopped

I am honestly stumped. I tried the Apple Dev forums only to get no help. Any ideas?