Images do show in pdf-preview, but not in pdf

Hi,

first of all thank you for the great plugin, it is exactly what I needed.

Now the problem: I also need images in the pdf. From what I have seen, generally this should not be a problem for DOMpdf. However, wordpress seems to introduce some difficulties.

In the pdf, dompdf throughs out
Image not readable or empty

Generally, wordpress will transfer pretty much all forms of image source to absolute URLs starting with http://. The only alternative I could find was starting with ../../wordpress/wp-content etc. However, in both cases, the image can be seen in the preview, while in the pdf you get the error message from above.

Do you (or anyone else) have any suggestions on this?

Thank you!

https://wordpress.org/plugins/wp-pdf-templates/