When you want to set up a page with (for instance) images from the DAM, you can't use the related content module. When you want to add a DAM asset to a content page, you can add links to text or images that refer to the asset.
First, you'll need to get the link to the asset. Select the image in your DAM (image bank), click 'Share' and copy the URL.
After that, you can create or edit a page with content.
Here, link the URL to a text:
Then paste the URL of the image here:
You can also add the link to an image. You can add an image by drag-and-drop it into the text field. Then select the image and create the link.