Attachments bigger than 10 MB

I tried to upload a PDF which was bigger then 10 MB. 

I didn't receive an error message. But then I saw the small information "PNG, JPG, PDF, XLSX, DOCX, CSV, ZIP - up to 10 MB".

So I think there should be an error message like "filesize to big".

But on the other hand: is it possible to raise this limitation? Sometimes our flyers (as PDF) are bigger then 10 MB.

Maybe also as an one-time purchase or something like this.