RPI4 Ubuntu Appliance Nextcloud no web UI

Hi, I installed Ubuntu Appliance Nextcloud on my RPI4, I have access to it through ssh, but it is impossible to access it through the web UI even though I’m connected on the same network and I have the IP of the RPI
Could you help me, I don’t know if I need to start nextcloud with the snap command (even though I tried it and it changed nothing) or if I need to edit some settings to make the web UI work
Thank you in advance for your time☻