             try? FileManager.default.removeItem(at: filePath)
             return
         }
-        MXSyncResponseFileStoreConstants.fileOperationQueue.async {
+        Constants.fileOperationQueue.async {
             try? syncResponse.jsonString()?.write(to: self.filePath,
                                                   atomically: true,
-                                                  encoding: MXSyncResponseFileStoreConstants.fileEncoding)
+                                                  encoding: Constants.fileEncoding)
         }
     }
     

/// Sync response storage in a file implementation.
public class MXSyncResponseFileStore: NSObject {
    
    private enum MXSyncResponseFileStoreConstants {
        static let folderName = "SyncResponse"
        static let fileName = "syncResponse"
        static let fileEncoding: String.Encoding = .utf8

        }
        var fileContents: String?
        
        Constants.fileOperationQueue.sync {
            fileContents = try? String(contentsOf: filePath,
                                       encoding: Constants.fileEncoding)
        }
        guard let jsonString = fileContents else {
            return nil
