Prohibited file extension message for Attachment on portal is not showing

[stannard95]

For some reason when I upload a file on the Portal, I don't get the message at all, and the attachment doesn't get added.

Not sure why, it's very OOTB, any ideas?

[Jaspal Singh]

Hi,

Is it coming from some Client script? If so, can you make sure UI Type:Both for the client script.

[stannard95]

It comes from a UI Page:

[Ankur Bawiskar]

Hi,

there is this system property which holds the list of extensions which are allowed to be used in file attachment.

Check if vsd extension is present in that list

https://hi.service-now.com/kb_view.do?sysparm_article=KB0718013

Error message received when attempting to add attachment to a record on an instance

Regards
Ankur

[stannard95]

It's not there as it should be. In the backend form, it shows the message as expected, but doesn't show on the Portal.