> For the complete documentation index, see [llms.txt](https://overleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://overleaf-pro.ayaka.space/latex/da/vidensbase/163-why-does-it-sometimes-take-a-lot-of-time-to-show-the-pdf-preview.md).

# Hvorfor tager det nogle gange lang tid at vise pdf-forhåndsvisningen?

Dette kan skyldes fejl i dokumentet, du arbejder på — forhåndsvisningen opdateres kun, når dokumentet kan kompileres uden fejl. Eventuelle fejl forhindrer derfor forhåndsvisningen i at opdatere, og den vil blive ved med at vise den senest vellykkede kompilering, indtil fejlene er rettet.

Du kan se eventuelle fejl i dit dokument ved at føre musen over ordet 'error' øverst til højre i forhåndsvisningen. En almindelig fejl er for eksempel, at matematiske symboler skal sættes i dollartegn, f.eks. $$\phi$$ i stedet for bare \phi.

Hvis PDF-forhåndsvisningen ikke opdateres, selv når fejlene er rettet, så [lad os vide det](https://www.overleaf.com/contact) vil vi gerne kigge på det for dig.


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