Copy or move file between folders gives an error: could not copy

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Nextcloud version (eg, 15.0.4):
Operating system and version (eg, CentOS):
Apache: 2.4.38
PHP version: 7.2.15
Redis active (default config)
Working Collabora (although the templates do not work)

The issue you are facing:

In the web interface:
I’ve user1 as Admin. User1 has created 3 folders next to his own documents.
Each folder is shared with a different group with read, write and delete rights.
user2 is also admin and member of all groups.

When user2 wants to copy or move a file to one of the shared folders, there is an error. File can not be copied or moved.

There are no errors in the log. Also not in the server log.
I’ve run the occ commands to repair and scan all files again. There are nog messages about a wrong config.

Execting the same copy or move through WebDAV (I use RaiDrive for this) works without any problem !!

Is this the first time you’ve seen this error? N: NO, Previous version had same problem.

Steps to replicate it:

  1. Admin share various folders with groups
  2. Admin member copy a file from one of the shared folders to an other shared folder

The output of your Nextcloud log in Admin > Logging:

Error	PHP	Undefined index: preview at /home/overdu/domains/

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

$CONFIG = array (
  'instanceid' => 'ocmqctxkiog4',
  'passwordsalt' => 'xxxx/',
  'secret' => 'xxxe',
  'trusted_domains' => 
  array (
    0 => '',
  'datadirectory' => '/home/overdu/domains/',
  'overwrite.cli.url' => '',
  'dbtype' => 'mysql',
  'version' => '',
  'dbname' => 'overdu_xxx',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'overdu_xxx',
  'dbpassword' => 'xxxS',
  'installed' => true,
  'mail_domain' => '',
  'mail_from_address' => 'Cloud',
  'mail_smtpmode' => 'smtp',
  'mail_smtpsecure' => 'ssl',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_smtpauth' => 1,
  'mail_smtphost' => '',
  'mail_smtpport' => '465',
  'mail_smtpname' => '',
  'mail_smtppassword' => 'xxx',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'localhost',
    'port' => 11563,
    'timeout' => 1.5,
    'password' => 'fxxxa',
    'dbindex' => 0,
  'activity_expire_days' => 15,
  'filelocking.enabled' => 'true',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
  'default_language' => 'nl',
  'knowledgebaseenabled' => true,
  'remember_login_cookie_lifetime' => 5184000,
  'skeletondirectory' => '/home/overdu/domains/',
  '' => 'stable',
  'updater.secret' => 'xxxx',

The output of your Apache/nginx/system log in /var/log/____: