Stored procedure not inserting data into table

I'm trying to implement a stored procedure like this where it's going to compare UserID from another table. If that user id already exists in dbo.user info table, it will insert data into [dbo].[BulkUploadTagDetail] table.

Every time I execute this stored procedure running into an issue that the data doesn't get inserted into my database table.

CREATE PROCEDURE [dbo].[InsertBulkUploadTagDetail]
    (@BulkTagID INT,
     @PortalUserID UNIQUEIDENTIFIER,
     @EmailAddress VARCHAR(256),
     @BulkUploadFileName VARCHAR(256),
     @CreatedOn DATETIME2(7),
     @IsCompleted BIT = 0)
AS
BEGIN 
    SET NOCOUNT ON

    IF EXISTS (SELECT UserID
               FROM dbo.UserInfo
               WHERE UserID = @PortalUserID)
    BEGIN
        UPDATE [unp]
        SET [unp].[BulkTagID] = @BulkTagID,
            [unp].[UserID] = @PortalUserID,
            [unp].[EmailAddress] = @EmailAddress,
            [unp].[BulkUploadFileName] = @BulkUploadFileName,
            [unp].[CreatedOn] = GETUTCDATE(),
            [unp].[IsCompleted] = @IsCompleted
        FROM 
            [dbo].[InsertBulkUploadTagDetail] unp
        INNER JOIN
            [dbo].[UserInfo] uinfo ON [unp].[UserID] = [uinfo].[UserID]
        WHERE
            [unp].[UserID] = @PortalUserID
    END
    ELSE
    BEGIN
        INSERT INTO [dbo].[BulkUploadTagDetail] 
                    ([BulkTagID], [PortalUserID], [EmailAddress],
                     [BulkUploadFileName], [CreatedOn], [IsCompleted])
        VALUES (@BulkTagID, @PortalUserID, @EmailAddress,
                @BulkUploadFileName, @CreatedOn, @IsCompleted)
    END
END