注意：推送文件块时，两个成功块之间的时间应该在设定时间（60秒）内完成。
Task<Result> PushFileSectionAsync(
string targetId,
FileResourceLocator fileResourceLocator,
FileSection fileSection,
CancellationToken cancellationToken
)Function PushFileSectionAsync (
targetId As String,
fileResourceLocator As FileResourceLocator,
fileSection As FileSection,
cancellationToken As CancellationToken
) As Task(Of Result)abstract PushFileSectionAsync :
targetId : string *
fileResourceLocator : FileResourceLocator *
fileSection : FileSection *
cancellationToken : CancellationToken -> Task<Result> [缺少 "M:TouchSocket.Dmtp.FileTransfer.IDmtpFileTransferActor.PushFileSectionAsync(System.String,TouchSocket.Dmtp.FileTransfer.FileResourceLocator,TouchSocket.Dmtp.FileTransfer.FileSection,System.Threading.CancellationToken)" 的 <returns> 文档]