Pdf file atrachment not getting attached

Where can we see the website in question?

https://www.forsvarsforeningen.no/arsmeldingsskjema/

I have a copy for testing here which allows PDFs: https://www.forsvarsforeningen.no/test/

See Editing form template

What content do you have in the Form tab panel?

From the test:

[file fil limit:5MB]
[file fil2 limit:5MB]
[file file-test filetypes:image/*|txt|application/pdf limit:10mb]

I have also tried filetypes:pdf|jpg|jpeg|png

The first two upload lines does not have any restrictions. Here PDFs are nota allowed at all. If I allow PDFs by the two mentioned ways, the get uploaded but disapear from the received mail. All other formats gets attached.

See File uploading and attachment to set up form-tags appropriately.

I have, and even copies your example, but I must be missing something?

I have now copied your example once again. Still no good:

[file fil limit:5MB]
[file fil2 filetypes:pdf|txt limit:2mb]
[file file-test filetypes:image/*|txt|application/pdf limit:10mb]

What is the problem now?

The same as always. PDF files do not show in the email. All other file formats does.

See Setting up mail

What email settings do you have in the Mail tab panel?

To protect personal data, hiding email addresses in the settings or replacing them with dummy addresses is strongly advised. You can also include screenshots.