Hello Project Owner,
This is to say, image at www.megasun.de/de/social-media-units/p9s/ is too tiny for 300 width outside banner to get into the print quality. Does it mean, we designers, we have to use this image as a placement image and afterwards you will provide us with big image for the prepress ? Looking forward to your reply, Inga Design

Yes that would be okay.

Maybe the photos from this link are good enough


https://media.kbl.de/europe-rest-of-world/aktuelle-solarien-und-collarien/p9s-serie/bilder/p9s-01-hybridsun-open-magicsilver.jpg