<PackageReference Include="Relativity.ObjectManager" Version="10.0.275.2" />

IFileFieldManager

public interface IFileFieldManager : IDisposable
Task<IKeplerStream> DownloadAsync(int workspaceID, RelativityObjectRef objectRef, FieldRef field)

Task<FileRef> UploadAsync(int workspaceID, FieldRef field, RelativityObjectRef objectRef, string fileName, IKeplerStream file)

Task<FileRef> UploadAsync(int workspaceID, FieldRef field, RelativityObjectRef objectRef, string fileName, IKeplerStream file, IProgress<ProgressReport> progress)

Task<FileRef> UploadAsync(int workspaceID, FieldRef field, RelativityObjectRef objectRef, string fileName, IKeplerStream file, CancellationToken cancel, IProgress<ProgressReport> progress)