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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
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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): 25.0.0
Operating system and version (eg, Ubuntu 20.04): Raspbian 10 Docker
Apache or nginx version (eg, Apache 2.4.25): included
PHP version (eg, 7.4): included
I am using the nextcloud:latest image from docker hub.
The issue you are facing:
I get the message This directory is unavailable, please check the logs or contact the administrator when opening the files tab. I also can not see any files.
Used space is correctly shown in the bottom left and occ files:scan --all returns a number that seems reasonable.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
Honestly… no idea. I just upgraded from Version 24.x to 25.0.0
The output of your Nextcloud log in Admin > Logging:
[webdav] Error: TypeError: OCA\DAV\Connector\Sabre\FilesPlugin::OCA\DAV\Connector\Sabre\{closure}(): Return value must be of type ?int, float returned at <<closure>>
0. /var/www/html/3rdparty/sabre/dav/lib/DAV/PropFind.php line 95
OCA\DAV\Connector\Sabre\FilesPlugin->OCA\DAV\Connector\Sabre\{closure}("*** sensitive parameters replaced ***")
1. /var/www/html/apps/dav/lib/Connector/Sabre/FilesPlugin.php line 356
Sabre\DAV\PropFind->handle("{http://owncloud.org/ns}size", Closure {})
2. /var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php line 89
OCA\DAV\Connector\Sabre\FilesPlugin->handleGetProperties(Sabre\DAV\PropFind {}, OCA\DAV\Files\FilesHome {})
3. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 1052
Sabre\DAV\Server->emit("propFind", [Sabre\DAV\PropF ... }])
4. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 984
Sabre\DAV\Server->getPropertiesByNode(Sabre\DAV\PropFind {}, OCA\DAV\Files\FilesHome {})
5. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 1662
Sabre\DAV\Server->getPropertiesIteratorForPath("files/david", ["{DAV:}getlastm ... "], 1)
6. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 1647
Sabre\DAV\Server->writeMultiStatus(Sabre\Xml\Writer ... ]}, Generator {}, false)
7. /var/www/html/3rdparty/sabre/dav/lib/DAV/CorePlugin.php line 346
Sabre\DAV\Server->generateMultiStatus(Generator {}, false)
8. /var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php line 89
Sabre\DAV\CorePlugin->httpPropFind(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
9. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 472
Sabre\DAV\Server->emit("method:PROPFIND", [Sabre\HTTP\Requ ... }])
10. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 253
Sabre\DAV\Server->invokeMethod(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
11. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 321
Sabre\DAV\Server->start()
12. /var/www/html/apps/dav/lib/Server.php line 360
Sabre\DAV\Server->exec()
13. /var/www/html/apps/dav/appinfo/v2/remote.php line 35
OCA\DAV\Server->exec()
14. /var/www/html/remote.php line 167
require_once("/var/www/html/a ... p")
PROPFIND /remote.php/dav/files/david/
from 172.18.0.4 by david at 2022-10-24T22:11:46+00:00
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'trusted_proxies' =>
array (
0 => '127.0.0.1',
),
'overwritehost' => 'my.cool.domain',
'overwriteprotocol' => 'https',
'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' => 'ocuc8455g6x2',
'passwordsalt' => 'SEzHnVTqv7Im55SqUFPUEW/n81kmOr',
'secret' => 'vtdTbEe7snNxG+Sizde+2VSEN++RoVMxqaQ6hM9n2Sou7xn+',
'trusted_domains' =>
array (
0 => 'my.cool.domain',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'mysql',
'version' => '25.0.0.18',
'overwrite.cli.url' => 'https://my.cool.domain',
'dbname' => 'nextcloud',
'dbhost' => 'mariaDB:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'oc_david',
'dbpassword' => 'TbLrleZ2MeVgJPq6WOoSCU3fiG0TDb',
'installed' => true,
'check_data_directory_permissions' => false,
'maintenance' => false,
'theme' => '',
'loglevel' => 0,
'app_install_overwrite' =>
array (
0 => 'unsplash',
),
);
Errors in admin panel: https://dude-this-is-a-very.questionable.link/5LeOox0Uf.png (This is a sharex image hoster)
Edit: I am also geting this https://questionable.link/5LePLx2ih.png warning in the admin overview which leads me to assume that there might be a problem with file permissions. I have no idea however on how I would fix these (as I can’t chown to a user that lives inside a docker container from my host machine).
