Hi All I saw this error " cannot connect to server at this moment"…while browsing the file or image…
What happened ?
That you can’t connect to the server? Do you see something on the access-log of your webserver at that time? Is this happening when you are on a stable internet connection via wifi?
Same problem 
@Sn0wCooder logs please!
Nextcloud, Apache access, Apache error, anything that shows what you’d maybe consider an issue.