Can't see an attached file using the default file attachment paperclip

[Dave65]

We have a user who can attach a file to a form using the paperclip attachment icon but when she does, you don't see that the form has been attached.

However, if you submit the form and then go to the record, the file is there on the record.

She is one of our testers and this issue caused her to fail some tests until we found that she is the only one (to the best of our ability) who has this problem.

I Checked the property "List of roles (comma-separated) that can create attachments:" and it's set to public,snc_internal and she has the snc_internal role, so that's not the issue.
I tried a very basic user in my PDI with no roles listed and they were able to add an attachment and it showed on the form so I don't think it has anything to do with roles.

One of my co-workers was looking into this before me and he looked at ACLs and Business Rules. Most all the ACLs on sys_attachment are OOTB and the Business Rules look untouched. There are some new BRs on the sys_attachment table, but the condition on them look narrow in scope and shouldn't fire off to impact us.

Still researching the root cause.

Has anyone ever seen this before?

Any ideas of where to look?

Thanks in advance for any help you can offer!

[SanjivMeher]

Are there any client script doing some dom manipulation to hide it?

Did you also impersonate to her account and check just to make sure it is not her browser issue?

[Dave65]

There are no client scripts that I have seen doing any DOM manipulation. 

Several of us have impersonated her and were able to get the same result.

[SanjivMeher]

Can you provide the table name/form on which you see this issue?

Also a screenshot where she doesn't see the attachment.

And if you do right click and inspect element, can you check if there are any error after attaching?

[Dave65]

It happens on any Record producer using the paper clip attachment icon.

I added an attachment but it is not showing. However, if I complete the form and submit it, the attachment is on the record that gets created.

No errors show up in the console.

This issue happens in Chrome, Edge and Fire fox and in all of our environments for this user, There may be other users but there are too many to do a 100% test.