My health insurance provider has a website (seems mostly server rendered but with dynamic elements) that links documents that you can only access once (it seems

My health insurance provider has a website (seems mostly server rendered but with dynamic elements) that links documents that you can only access once (it seems). They're real links that will open a new tab when middle-clicked. ... but not of the document since the document is opened through some JS crap. Thank you, Techniker-Krankenkasse.