ServiceNow Secure Attachment – Large Image Downloaded as Corrupted File

[salemrajpau]

Hi everyone,

We are facing an issue with ServiceNow Secure Attachment download.

Issue

* File upload is working successfully and the attachment record is created.
* Large/high-quality images are getting corrupted during download.
* The same image works correctly when reduced to around 300–500 KB.
* The issue is observed through the attachment download flow in both Native UI and Portal.

Current Download Flow

Client Script / UI Page / Portal Widget → SecureAttachmentUtil Script Include → Azure/SAS → File Download

The main backend download logic is handled in the SecureAttachmentUtil Script Include.
Could someone advise on the correct way to handle large binary attachments returned from Azure/SAS in ServiceNow?

[sandeepdutt]

Hi @salemrajpau ,

I would check a few things :

1.  Avoid using .toString() or parse binary response bodies as standard JavaScript strings this actually corructs the sequences above 300 KB.

2. Would check both the sys_attachment and sys_attachment_doc table if something is being missed or some user might not have access .