HeyWatchOutDude

How can I set it to "snappdf"?

No, I'm not using docker. I have used the following guide: https://www.linuxbabe.com/ubuntu/install-invoiceninja-ubuntu-20-04-apache-nginx/amp

Do it like on the iOS App (Disable local caching) - image previews are still generated.

Facing the same issue.

Just setup a reverse proxy (example: apache2 or nginx) on your host machine and pass the traffic from 443/TCP to 8080/TCP. Recommendation: Create a certificate from local CA (example: easy-rsa),...

Same issue. Nextcloud logs: GuzzleHttp\Exception\ConnectException: cURL error 28: Connection timed out after 45001 milliseconds (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://cloud.example.com/apps/richdocumentscode/proxy.php?req=/hosting/discovery