When trying to open a pdf file via the webbrowser, I am getting a page with the errorcURL error 3 error page.
I am running nextcloud 20.0.4 as a snap on ubuntu server
Everthing goes fine if I open the same pdf file via the app on a android device.
I did not change anything on my server except installing the latest app updates and updates on my server.
I understand your reasoning. But it’s its true did not change anything except what I mentioned.
For the moment I can not find error’s in the logs. In which logs could I check?
As I wrote, check the “Nextcloud log file” which by default should be found in the Nextcloud data directory, except you’ve configured a different location.