How to upload an image to sys_attachment table via Custom Service Portal Widget?

[AyanshN]

Hi everyone,

I'm working on a custom widget in Service Portal where I need to allow users to upload an image file (e.g., PNG or JPEG) and store it in the `sys_attachment` table, associated with a specific record (e.g., `sc_req_item`).

I'm not using the default file upload functionality (`nowAttachmentHandler`) due to customization needs, and would like to implement this purely through client-side code inside the widget.

### My questions:

1. What is the best practice to upload a file to the `sys_attachment` table from a custom widget?
2. Is there a standard REST endpoint or method I should use in the client controller to send the file?
3. Are there security considerations I should be aware of when uploading base64-encoded data?
4. How can I ensure the uploaded image is properly associated with a specific record (e.g., by `table_name` and `table_sys_id`)?

Any examples or guidance would be much appreciated. Thank you!

[Mike Lynch]

The Attachment API Post method should cover what you need:
https://www.servicenow.com/docs/bundle/xanadu-api-reference/page/integrate/inbound-rest/concept/c_At...

Although  "due to customization needs" sounds like the real problem here. What are those needs that cannot be overcome by configuraiton or cloning an OOTB attachment widget and modifying?

[Ankur Bawiskar]

@AyanshN 

where are you planning to place it? share some screenshots

check these links on how it can be done

How to add an attachment functionality in a service portal widget form? 

Drag & Drop Attachments for Service Portal - FREE Widget 

If my response helped please mark it correct and close the thread so that it benefits future readers.