[DW 19 on macOS] How to use a symbolic link for a local (image) directory?

Hi.

I have 3 different versions of a web magazine locally:

domain.tld (the active version)

draft.domain.tld (the version with new articles not yet published, but short before)

beta.domain.tld (the version with major changes, which needs further development, a field for experiments, tests, etc.)

I like to use the images of one of these three local directories in the two other directories in form of a symbolic link.

So I created a symbolic link of "~/websites/domain/draft.domain.tld/img" in "~/websites/domain/beta.domain.tld/"

In the file manager of the macOS the "~/websites/domain/beta.domain.tld/img" is shown with a little arrow and works without problems. I can access all the images.

But in DW does show in his internal file manager: "For this extension no valid editor could be found"

My question:
How can use a symbolic link of a directory in DW please?

Thanks.