Upload Images to Serial Number - acumatica

Question

I have created a custom NOTEID field in InItemLotserial Table to upload images for each serial number in a custom page. It works fine without any issue.
I have wrote a processing page to update the images for existing serial numbers.
protected void AttachImage(InfoINItemLotSerialImport row, INItemLotSerial ser, InventoryItem itm)
{
string imageurl = row.ImageSourceUrl;
string imageType = row.ImageType;
string sRetVal = string.Empty;
if (itm != null)
{
if (ser != null)
{
try
{
WebClient wc = new WebClient();
byte[] buffer = wc.DownloadData(imageurl);
//MemoryStream ms = new MemoryStream(bytes);
string fileName = Path.GetFileName(imageurl);
fileName = string.Format("Serial Number attribute ({0} {1})\\{2}", itm.InventoryID, ser.LotSerialNbr, fileName);
PX.SM.FileInfo fileinfo = null;
PX.SM.UploadFileMaintenance filegraph = PXGraph.CreateInstance<PX.SM.UploadFileMaintenance>();
fileinfo = new PX.SM.FileInfo(fileName, null, buffer);
fileinfo.IsPublic = true;
if (filegraph.SaveFile(fileinfo))
{
ItemLotSerialMnt oLotSerMnt = PXGraph.CreateInstance<ItemLotSerialMnt>();
oLotSerMnt.lotserailrecdata.Current = ser;
oLotSerMnt.lotserial.Current = ser;
PXNoteAttribute.SetFileNotes(oLotSerMnt.lotserailrecdata.Cache, oLotSerMnt.lotserailrecdata.Current, fileinfo.UID.Value);
PXNoteAttribute.SetNote(oLotSerMnt.lotserailrecdata.Cache, oLotSerMnt.lotserailrecdata.Current, "");
sRetVal = fileinfo.Name;
}
}
catch
{
}
}
}
}
It uploads the data into UploadFile table and entry looks fine. I can access the image using the URL, but the same is not reflecting in file section of serial page.
How acumatica links the file with the screen?
Update 1
#region UsrNoteID
public abstract class usrNoteID : PX.Data.IBqlField
{
}
protected Guid? _UsrNoteID;
[PXNote()]
public virtual Guid? UsrNoteID
{
get
{
return this._UsrNoteID;
}
set
{
this._UsrNoteID = value;
}
}
#endregion

Answer 1

Accumatica support helped me to fix the issue. I have missed firing persist event to save.
if (filegraph.SaveFile(fileinfo))
{
ItemLotSerialMnt oLotSerMnt = PXGraph.CreateInstance<ItemLotSerialMnt>();
oLotSerMnt.lotserailrecdata.Current = ser;
oLotSerMnt.lotserial.Current = ser;
PXNoteAttribute.SetFileNotes(oLotSerMnt.lotserailrecdata.Cache, oLotSerMnt.lotserailrecdata.Current, fileinfo.UID.Value);
PXNoteAttribute.SetNote(oLotSerMnt.lotserailrecdata.Cache, oLotSerMnt.lotserailrecdata.Current, "");
sRetVal = fileinfo.Name;
oLotSerMnt.Persist();
}
oLotSerMnt.Persist();