STM32L496VG USB CDC(VCP) Receive function

Hello guys. I configure the CDC on CubeMX. But the function CDC_Receive_FS receive1 byte each. That is, if I transmit 12345678 then I receive only 8.

I have to modify the function like this:

uint8_t UserDataReceive[100];
uint16_t i = 0;
static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
{
/* USER CODE BEGIN 6 */
USBD_CDC_SetRxBuffer(&hUsbDeviceFS, &Buf[0]);
memcpy(UserDataReceive + i, Buf, *Len);
++i;
// 
USBD_CDC_ReceivePacket(&hUsbDeviceFS);
return (USBD_OK);
/* USER CODE END 6 */
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In an array uint8_t UserRxBufferFS[APP_RX_DATA_SIZE] I receive such bytes when sending 12345678:

[0] - 0x38

[1] - 0x41

[2] - 0x6D.

Why? Please help!

I would like to take all of the transmitted packet, and not one byte processing. Can somewhere the settings for the life of the package are available?