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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, 18.0.2): 19.03
Operating system and version (eg, Ubuntu 20.04):Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): nginx 1.19.2
PHP version (eg, 7.1): 7.4.10
The issue you are facing:
We have a SMB-share for our office files. As some users needed to have access to certain files when they are out of the office, I installed a new server running Nextcloud with the External storage support app to get access to the SMB-share. The access is controlled via LDAP-app.
Unfortunately the client does not recognize any changes directly made on the SMB-share, which most of others users still use.
There is a service running in the background:
/usr/bin/php /var/www/nextcloud/occ files_external:notify -v -u <username> -p <password> <mount-id>, which recognizes all changes.
Having a cronjob with the command
sudo -u www-data php /var/www/nextcloud/occ files:scan --all --unscanned
Also other variants of this command (without --unscanned, with username, …) do not help.
Sometimes the files are synced, as soon as I log on to the web GUI and navigate to the corresponding folder.
Is this the first time you’ve seen this error? (Y/N): Y, but I did not see it working any time.
Steps to replicate it:
- Fresh Nextcloud installation
- Install & activate External storage support
- Sync folder via desktop client (3.0.1 macOS)
The output of your Nextcloud log in Admin > Logging:
{"reqId":"dfNMnNuuM2mKJTnDXbDk","app":"/var/www/nextcloud/occ files:scan --unscanned --all","message":"+++ Cron Filescan Completed. Execution time: 0 minutes and 1 seconds +++","level":1,"time":"2020-09-29T17:09:23+02:00","id":"5f7353db78592"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
$CONFIG = array (
'passwordsalt' => '***',
'secret' => '+csbgCA/***',
'trusted_domains' =>
array (
0 => 'cloud.***.de',
1 => '10.0.1.163',
),
'datadirectory' => '/var/nc_data',
'dbtype' => 'mysql',
'version' => '19.0.3.1',
'overwrite.cli.url' => 'https://cloud.***.de',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:/var/run/mysqld/mysqld.sock',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => '******',
'installed' => true,
'instanceid' => 'ocpfzrwxu3fa',
'activity_expire_days' => 14,
'auth.bruteforce.protection.enabled' => true,
'blacklisted_files' =>
array (
0 => '.htaccess',
1 => 'Thumbs.db',
2 => 'thumbs.db',
),
'cron_log' => true,
'enable_previews' => true,
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\PNG',
1 => 'OC\\Preview\\JPEG',
2 => 'OC\\Preview\\GIF',
3 => 'OC\\Preview\\BMP',
4 => 'OC\\Preview\\XBitmap',
5 => 'OC\\Preview\\Movie',
6 => 'OC\\Preview\\PDF',
7 => 'OC\\Preview\\MP3',
8 => 'OC\\Preview\\TXT',
9 => 'OC\\Preview\\MarkDown',
),
'filesystem_check_changes' => 0,
'filelocking.enabled' => 'true',
'htaccess.RewriteBase' => '/',
'integrity.check.disabled' => false,
'knowledgebaseenabled' => false,
'logfile' => '/var/nc_data/nextcloud.log',
'loglevel' => 2,
'logtimezone' => 'Europe/Berlin',
'log_rotate_size' => 104857600,
'maintenance' => false,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'overwriteprotocol' => 'https',
'preview_max_x' => 1024,
'preview_max_y' => 768,
'preview_max_scale_factor' => 1,
'redis' =>
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 0.0,
),
'quota_include_external_storage' => false,
'share_folder' => '/Shares',
'skeletondirectory' => '',
'theme' => '',
'trashbin_retention_obligation' => 'auto, 7',
'updater.release.channel' => 'stable',
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
);
The output of your Apache/nginx/system log in /var/log/____:
nothing