Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 28.0.0
Operating system and version (eg, Ubuntu 20.04): 20.04.6 LTS
Apache or nginx version (eg, Apache 2.4.25): Nginx 1.20.1
PHP version (eg, 7.4): 8.2.13
The issue you are facing:
I have a nextcloud setup with docker.
After Updating from Nextcloud 26 to 28 files from users and group folders are not shown in the Webinterface anymore for other users.
I as the admin can still see all the files but no other account can see anything or even create own folders via the web interface.
The most bizarre thing is that via webdav everything is working fine.
The Dashboard lists files in the subfolders and via there the users are able to get in the folders that are not visible.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
Currently unknown happent after updating via Docker Pull
The output of your Nextcloud log in Admin > Logging:
only Error i could find
[webdav] Fehler: multikeydecrypt with share key failed:error:0200009F:rsa routines::pkcs decoding error
PROPFIND /remote.php/dav/files/5488D65B-1FD7-464F-B19E-EF0195036951/
von x.x.x.x von 5488D65B-1FD7-464F-B19E-EF0195036951 um 08.01.2024, 13:31:56
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'htaccess.RewriteBase' => '/',
'memcache.local' => '\\OC\\Memcache\\APCu',
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'instanceid' => 'XXX',
'passwordsalt' => 'XXX',
'secret' => 'XXX',
'trusted_domains' =>
array (
0 => 'nextcloud.private.info',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'mysql',
'version' => '28.0.0.11',
'overwrite.cli.url' => 'http://nextcloud.private.info',
'dbname' => 'ncdb',
'dbhost' => 'nc_db',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'user',
'dbpassword' => 'XXX',
'installed' => true,
'log.condition' =>
array (
'apps' =>
array (
0 => 'admin_audit',
),
),
'log_type_audit' => 'file',
'logfile_audit' => 'audit.log',
'log_type' => 'file',
'logfile' => 'nextcloud.log',
'loglevel' => 2,
'logdateformat' => 'F d, Y H:i:s',
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'overwriteprotocol' => 'https',
'mail_from_address' => 'cloud',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => 'XXX.cc',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'XXX.XXX.cc',
'mail_smtpport' => '465',
'mail_smtpname' => 'cloud@XXX.cc',
'mail_smtppassword' => 'XXX',
'mail_smtpsecure' => 'ssl',
'twofactor_enforced' => 'true',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
'default_phone_region' => 'DE',
'maintenance' => false,
'app_install_overwrite' =>
array (
0 => 'geoblocker',
1 => 'breezedark',
),
);
The output of your Apache/nginx/system log in /var/log/____:
Pastebin of Docker Log output:
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
Pastebin of Log: