Pictures as PDF format not showing

I just started learning LaTeX to make a poster. I am currently using TexWorks/MiKTeX. I want to insert some pictures to my poster. I have tried inserting pictures in .jpg format and it worked. However, i need to print this poster and i know that the pictures will be pixelated. The other solution is to insert the pictures in PDF format, i tried to insert the pictures in pdf format and it worked (kind of), there were no errors. However the pictures were not appearing in the preview. I have search in Google and followed all the suggestions, but the pictures are still not appearing. What do i need to do? Here are the codes:

    \begin{figure}[h]
\centering
\includegraphics[width=.95\textwidth]{Knowledge-Graph-Vektordatei}
\caption{Knowledge Graph des Hotels}
\end{figure}

• Please provide full MWE. – ivankokan Dec 5 '19 at 14:44
• Welcome to TeX.SE! What ivankokan said. A minimal working example not only makes it much easier to help you; constructing it also often solves your problem all on its own. – dgoodmaniii Dec 5 '19 at 14:53
• – naphaneal Dec 5 '19 at 19:44
• Does this answer your question? Includepdf as a figure – naphaneal Dec 5 '19 at 19:45