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Sorry to hear you’re facing problems 
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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): Nextcloud Hub 7 (28.0.1)
Operating system and version (eg, Ubuntu 20.04): Linux 6.1.67 x86_64
Apache or nginx version (eg, Apache 2.4.25): replace me
PHP version (eg, 7.4): 8.2
The issue you are facing:
Synchronization of directories is not complete. Server (manitu.de, vServer) and client (Ubuntu 22.04.3 LTS) are set up, the client shows a green check mark and does not give an error message. However, files in sub-directories on the server are missing (different types of user files e.g. .txt). These are loaded only when a new document is created in the local sub-directory. I verified the missing data with a second client and via the web interface.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
Neue Installation von Nextcloud auf Server und auf Client.
The output of your Nextcloud log in Admin > Logging:
keine Einträge
The output of your config.php file:
<?php
$CONFIG = array (
'default_language' => 'de',
'default_locale' => 'de_DE',
'default_phone_region' => 'DE',
'enable_previews' => 'false',
'skeletondirectory' => '',
'instanceid' => '*****',
'passwordsalt' => '****',
'secret' => '*****',
'trusted_domains' =>
array (
0 => '***.com',
),
'datadirectory' => '****',
'dbtype' => 'mysql',
'version' => '28.0.1.1',
'integrity.check.disabled' => true,
'trashbin_retention_obligation' => 'auto, 30',
'version_retention_obligation' => 'auto, 30',
'memcache.local' => '\\OC\\Memcache\\APCu',
'log_type' => 'file',
'logfile' => '/dev/null',
'localstorage.umask' => 7,
'overwrite.cli.url' => '****',
'dbname' => 'db100487',
'dbhost' => '****',
'dbport' => '',
'dbtableprefix' => 'nc_',
'mysql.utf8mb4' => true,
'dbuser' => 'u100487',
'dbpassword' => '***',
'installed' => true,
# 'memcache.distributed => \OC\Memcache\Memcached',
'filelocking.enabled' => true, #false,
# 'memcache.locking' => '\\OC\\Memcache\\Redis',
# 'redis' =>
# array (
# 'host' => 'localhost',
# 'port' => 6379,
# 'timeout' => 0.0,
Web-Error-Log
2024-01-05 12:44:06 ::1 authz_core:error 8895 AH01630: client denied by server configuration: /home/sites/site10003***1/web/***.com/apps/theming/img/core
2024-01-05 12:44:06 ::1 authz_core:error 8893 AH01630: client denied by server configuration: /home/sites/site10003***/web/***.com/apps/theming/img/core
2024-01-05 12:43:25 ::1 access_compat:error 8746 AH01797: client denied by server configuration: /home/sites/site10003***/web/***.com/data/.ocdata
2024-01-05 12:06:11 ::1 access_compat:error 24045 AH01797: client denied by server configuration: /home/sites/site10003***/web/***.com/data/.ocdata
2024-01-05 12:02:03 ::1 proxy_fcgi:error 22828 (70008)Partial results are valid but processing is incomplete: AH01075: Error dispatching request to : (reading input brigade)
2024-01-05 11:58:11 ::1 authz_core:error 19375 AH01630: client denied by server configuration: /home/sites/site10003***/web/***.com/apps/theming/img/core