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Document Attachment not uploading files

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Posted on by Ahsan baig 123

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I have created a document attachment fact box for my custom page.

I have copied similer code of what is in job card page attachment facboxes. Hovever i am getting following error when i attach a document.

how can i resolve the issue?

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Dynamics 365 Business Central

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Khushbu Rajvi. 22,424 Super User 2026 Season 1 on at

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Please check this: https://community.dynamics.com/forums/thread/details/?threadid=23a6fd5e-1c45-ef11-8409-6045bda935ce

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Khushbu Rajvi. 22,424 Super User 2026 Season 1 on at

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This too: https://www.youtube.com/watch?v=d2VPmjm3M-U

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GM-01091622-0 10 on at

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if you copied the Job Card attachments factbox 1:1, the upload error is usually one of two things:

1) Using the old factbox.

The classic “Document Attachment FactBox” is obsolete now. Swap it for “Doc. Attachment List Factbox” on your custom page. That alone fixed it for me. (MS Learn notes the old one is being replaced.)

2) The link isn’t pointing to your record correctly.

Make sure the factbox has a proper SubPageLink to your table and the key the attachment framework expects. For a simple header with a No. key it’s basically:

area(FactBoxes) { part(Attachments; "Doc. Attachment List Factbox") { ApplicationArea = All; SubPageLink = "Table ID" = const(Database::"My Custom Header"), "No." = field("No."); } }

If your table doesn’t use a field literally named No. (e.g., GUID or different PK), you need to map that key so the factbox can resolve the record. Easiest path is to expose a No.-style field that represents your key, or handle the record ref in an event subscriber (lots of folks do this in custom pages). A quick community thread + walkthrough here helps show the pattern.

Good refs (short + practical):

MS Learn: Add a FactBox to a page (how the FactBox area + SubPageLink work). Adding a FactBox to a page - Business Central | Microsoft Learn

MS Learn: Document Attachment table (1173) (what gets stored / how it ties to your record). https://learn.microsoft.com/en-us/dynamics365/business-central/application/base-application/table/microsoft.foundation.attachment.document-attachm

MS Learn: Doc. Attachment List Factbox (the new one you want to use). https://learn.microsoft.com/en-us/dynamics365/business-central/application/base-application/page/microsoft.foundation.attachment.doc.-attachment-list-factbox

If you drop the new factbox in and wire Table ID + your key correctly, the “attach document” error usually disappears. If not, share the exact error text and I’ll tweak the link mapping.

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Suresh Kulla 50,278 Super User 2026 Season 1 on at

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The Document Attachment feature is not active or supported for every table; you need to customize the subscription to events to make the upload work.

You need to subscribe to the events in Document Attachemnt Table, Page, and Factbox. See an example below

https://www.lfspl.com/blog/business-central-doc-attachment-list-factbox-custom-tables-integration

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YUN ZHU 101,022 Super User 2026 Season 1 on at

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This is a little more complicated than you might think, so hopefully the following examples will give you some hints.

How to add Attachments, Links, Notes Factbox to any pages

https://yzhums.com/11177/

Thanks.

ZHU

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Aakib khan 128 on at

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Try to use this demo code in your code:

pageextension 50117 VendorBankAccountCard extends "Vendor Bank Account Card"
{
actions
{
addfirst(Processing)
{
action(DocAttach)
{
ApplicationArea = All;
Caption = 'Attachments';
Image = Attach;
ToolTip = 'Add a file as an attachment. You can attach images as well as documents.';
trigger OnAction()
var
DocumentAttachmentDetails: Page "Document Attachment Details";
RecRef: RecordRef;
begin
RecRef.GetTable(Rec);
DocumentAttachmentDetails.OpenForRecRef(RecRef);
DocumentAttachmentDetails.RunModal();
end;
}
}
}
}
codeunit 50117 DocumentAttachment2
{
[EventSubscriber(ObjectType::Page, Page::"Document Attachment Factbox", 'OnBeforeDrillDown', '', false, false)]
local procedure OnBeforeDrillDown(DocumentAttachment: Record "Document Attachment"; var RecRef: RecordRef);
var
VendorBankAccount: Record "Vendor Bank Account";
begin
case DocumentAttachment."Table ID" of
DATABASE::"Vendor Bank Account":
begin
RecRef.Open(DATABASE::"Vendor Bank Account");
if VendorBankAccount.Get(DocumentAttachment."No.") then
RecRef.GetTable(VendorBankAccount);
end;
end;
end;
[EventSubscriber(ObjectType::Page, Page::"Document Attachment Details", 'OnAfterOpenForRecRef', '', false, false)]
local procedure OnAfterOpenForRecRef(var DocumentAttachment: Record "Document Attachment"; var RecRef: RecordRef; var FlowFieldsEditable: Boolean);
var
FieldRef: FieldRef;
RecNo: Code[20];
VendorBankCode: Code[20];
begin
case RecRef.Number of
DATABASE::"Vendor Bank Account":
begin
FieldRef := RecRef.Field(1);
RecNo := FieldRef.Value;
DocumentAttachment.SetRange("No.", RecNo);
FieldRef := RecRef.Field(2);
VendorBankCode := FieldRef.Value;
DocumentAttachment.SetRange("Vendor Bank Number", VendorBankCode);
FlowFieldsEditable := false;
end;
end;
end;
[EventSubscriber(ObjectType::Table, Database::"Document Attachment", 'OnAfterInitFieldsFromRecRef', '', false, false)]
local procedure OnAfterInitFieldsFromRecRef(var DocumentAttachment: Record "Document Attachment"; var RecRef: RecordRef)
var
FieldRef: FieldRef;
RecNo: Code[20];
VendorBankCode: Code[20];
begin
case RecRef.Number of
DATABASE::"Vendor Bank Account":
begin
FieldRef := RecRef.Field(1);
RecNo := FieldRef.Value;
DocumentAttachment.Validate("No.", RecNo);
FieldRef := RecRef.Field(2);
VendorBankCode := FieldRef.Value;
DocumentAttachment.Validate("Vendor Bank Number", VendorBankCode);
end;
end;
end;
}
tableextension 50100 DocumentAttachmentExt extends "Document Attachment"
{
fields
{
field(50100; "Vendor Bank Number"; Code[20])
{
DataClassification = CustomerContent;
}
}
}

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