Files not showing in web-ui

Nextcloud version: 27.0.0
Operating system and version (eg, Ubuntu 20.04): qnap Nas docker
Apache or nginx version (eg, Apache 2.4.25): installed via docker
PHP version (eg, 7.4): installed via docker
Docker: Docker version 20.10.17-qnap10, build 0474f29

The issue you are facing:
The files are not showing anymore in the webui:

as you can see here. They are still there and I can sync with the desktop client. But are not showing up.
I already ran occ files:scan-app-data and occ files:scan --all

Is this the first time you’ve seen this error? (Y/N): Yes

Steps to replicate it:

Maybe it has to do something with recognize tagging a lot of pictures? That is the last thing that happend.

The output of your Nextcloud log in Admin > Logging:

These errors are happening:

[spreed] Error: Getting the account information failed: account not found - HTTP status: 404 Response body: 

it seems to be a error with the talk Hosted high-performance backend but I cannot delete it because when I press “Delete the Signaling server account” this pops up: "There is no such account registered. ".

Then there is this one:

[PHP] Error: Optional parameter $trustedServers declared before required parameter $groupManager is implicitly treated as a required parameter at /var/www/html/apps/dav/lib/CardDAV/SystemAddressbook.php#60

GET /remote.php/dav/addressbooks/users/.../.../xxx.vcf?photo&size=64
from ip by user at 2023-06-27T04:31:47+00:00

This should be fixed with next release if I understood correctly on github.

And there is this one:

[PHP] Error: TypeError: OCA\Files_Sharing\Controller\DeletedShareAPIController::__construct(): Argument #4 ($UserId) must be of type string, null given at /var/www/html/apps/files_sharing/lib/Controller/DeletedShareAPIController.php#73

GET /ocs/v2.php/apps/files_sharing/api/v1/deletedshares?format=json&include_tags=true
from ip at 2023-06-27T04:17:36+00:00

This one happens when I try to permanently delete a file in the deleted files. Deleted files are the only ones that show up in the webui. I permanently deleted all but one throws this error.

Also this one:

[PHP] Error: dns_get_record(): A temporary server error occurred. at /var/www/html/lib/private/Http/Client/DnsPinMiddleware.php#58

GET /apps/integration_twitter/avatar?userId=xxx
from IP by user at 2023-06-27T03:51:36+00:00

not sure what this one is about.

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

$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 => 'xxx',
    1 => 'xxx',
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'mysql',
  'version' => '',
//  'overwrite.cli.url' => 'xxx',
//  'overwriteprotocol' => 'https',
  'dbname' => 'nextcloud',
  'dbhost' => 'db',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'xxx',
  'dbpassword' => 'xxx',
  'installed' => true,
  'twofactor_enforced' => 'false',
  'twofactor_enforced_groups' =>
  array (
    0 => 'normal',
    1 => 'admin',
  'twofactor_enforced_excluded_groups' =>
  array (
  'loglevel' => 2,
  'maintenance' => false,
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_sendmailmode' => 'smtp',
  'mail_smtpauth' => 1,
  'mail_smtpsecure' => 'ssl',
  'mail_from_address' => 'xxx',
  'mail_domain' => 'xxx',
  'mail_smtphost' => 'xxx',
  'mail_smtpport' => '465',
  'mail_smtpname' => 'xxx',
  'mail_smtppassword' => 'xxx',
  'ldapIgnoreNamingRules' => false,
  'default_phone_region' => 'AT',
  'theme' => '',
  'memories.exiftool' => '/var/www/html/custom_apps/memories/exiftool-bin/exiftool-amd64-glibc',
  'preview_max_x' => 2048,
  'preview_max_y' => 2048,
  'bulkupload.enabled' => false,
  'memories.vod.path' => '/var/www/html/custom_apps/memories/exiftool-bin/go-vod-amd64',
  'memories.vod.vaapi' => true,
  'memories.vod.vaapi.low_power' => true,
  'memories.gis_type' => 1,
  'memories.vod.ffmpeg' => '/usr/bin/ffmpeg',
  'memories.vod.ffprobe' => '/usr/bin/ffprobe',
  'app_install_overwrite' =>
  array (
    0 => 'memories',
    1 => 'side_menu',
    2 => 'files_archive',
    3 => 'extract',
    4 => 'maps',
    5 => 'metadata',
    6 => 'news',
    7 => 'registration',
    8 => 'files_3dmodelviewer',
    9 => 'video_converter',
    10 => 'talk_matterbridge',

The output of your Apache/nginx/system log in /var/log/____:
not sure where to find in docker container but can upload if needed.

Sorry no real idea. But you can also use browser dev tools (F12). Maybe you find some problems e.g. HTTP 404, …

I am getting this 404:

{"error":"Strict Cookie has not been found in request"}

Because of your error i found only this iusse but for Nextcloud Talk. Maybe it helps you or someone else gets the right idea.

I will try to rollback to v26 it updated recently to 27 and I am not sure if it came with the update.

Apparently downgrading is not supported. Hm.

Yes. You must use Restore from Backup.

Okay thanks but that will be the last option. Maybe before I have to do it someone knows what else I could try.

Does your browser dev tool window under Network show the reason anything is being blocked? Are you using any filters like uBlock Origin/etc?

What happens in a different browser (without any extensions active)?