Can not add new documents to existing package(transaction)

Hi Team, I use code to create packages, and when I go to the esign platform, I can not add new documents to the existing In Progress transaction. The code I'm using to create the package is PackageBuilder documentPackageBuilder = PackageBuilder.NewPackageNamed("Test Document Extraction") .WithSettings(DocumentPackageSettingsBuilder.NewDocumentPackageSettings() .WithoutOptOut() // .WithoutLanguageDropDown() .WithoutDecline() // .WithoutDocumentToolbarDownloadButton() .WithCeremonyLayoutSettings(CeremonyLayoutSettingsBuilder.NewCeremonyLayoutSettings() .WithoutSessionBar() )) .WithSigner(SignerBuilder.NewSignerWithEmail(signingPerson.GetValueOrDefault("Email")) .WithFirstName(signingPerson.GetValueOrDefault("FirstName", "")) .WithLastName(signingPerson.GetValueOrDefault("LastName", "")) // .WithSMSSentTo(signingPerson.GetValueOrDefault("Phone", "")) .WithCustomId("Client") .SigningOrder(1) ) .WithSigner(SignerBuilder.NewSignerWithEmail(icEmail) .WithFirstName(icFirstname) .WithLastName(icLastName) .WithCustomId("IC") .SigningOrder(2) ) .WithSigner(SignerBuilder.NewSignerWithEmail("[email protected]") .WithFirstName("ABC") .WithLastName("Compliance") .WithCustomId("ABCCompliance") .SigningOrder(3) ) .WithSigner(SignerBuilder.NewSignerWithEmail("[email protected]") .WithFirstName("ABC") .WithLastName("InvOps") .WithCustomId("ABCInvOps") .SigningOrder(4));