I am trying to connect Only Office mobile app to the next cloud server. Nextcloud doesn’t have ONLYOFFICE configured. I just want to run it to save documents. Same configuration is working fine with IOS, just android app is giving hard time. I am using self-signed certificate and I have already exported the certificate chain to android. When accessing Nextcloud on mobile browser, I am not getting any error.
Unfortunately there is no way to connect ONLYOFFICE Documents app on Android to Nextcloud with a self-signed certificate. I’d recommend obtaining CA-signed certificates, for instance Let’s Encrypt allows getting trusted certificates for free.