Installation issue

I’m not familiar with Drupal, and I could not find anything clear about what private://activitypub/cache means in terms of UNIX. After fiddling around I figured it might be by default $app_root/sites/default/files/activitypub/cache but it does not seem to be the case. I tried using $settings, etc. but never found a good solution: I’m stuck with the following errors:

image

If only I knew what is the corresponding path on the filesystem I could check for permissions. All the permissions are OK for www-data user which is running the PHP process.

Apart from this I have a running drupal 8 (9 would not install!) at https://drupal.demo.activitypub.eu that alledgedly support ActivityPub :innocent:

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