Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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): 23.0.2
Operating system and version (eg, Ubuntu 20.04): UNRAID 6.9.2
Apache or nginx version (eg, Apache 2.4.25): NGINX 2.9.16
PHP version (eg, 7.4): replace me
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it: In nextcloud, select a folder and the + button to select files to upload i.e. multiple photos and click choose to upload and immediately you will see list of errors begin to populate.
The output of your Nextcloud log in Admin > Logging:
Error no app in context Sabre\DAV\Exception\BadRequest: Expected filesize of 2164467 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 0 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.
/config/www/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php - line 155:
OCA\DAV\Connector\Sabre\File->put()
/config/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 1098:
OCA\DAV\Connector\Sabre\Directory->createFile()
/config/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php - line 504:
Sabre\DAV\Server->createFile()
/config/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php - line 89:
Sabre\DAV\CorePlugin->httpPut()
/config/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 472:
Sabre\DAV\Server->emit()
/config/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 253:
Sabre\DAV\Server->invokeMethod()
/config/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 321:
Sabre\DAV\Server->start()
/config/www/nextcloud/apps/dav/appinfo/v1/webdav.php - line 83:
Sabre\DAV\Server->exec()
/config/www/nextcloud/remote.php - line 166:
require_once("/config/www ... p")
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'memcache.local' => '\\OC\\Memcache\\APCu',
'datadirectory' => '/data',
'instanceid' => 'redacted',
'passwordsalt' => 'redacted',
'secret' => redacted
'trusted_domains' =>
array (
0 => '192.168.111.3:450',
1 => 'nextcloud.mydomain.ooo',
),
'dbtype' => 'mysql',
'version' => '23.0.2.1',
'overwrite.cli.url' => 'https://192.168.111.3:450',
'dbname' => 'nextcloud',
'dbhost' => '192.168.111.3:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => 'redacted',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_smtpauthtype' => 'LOGIN',
'mail_sendmailmode' => 'smtp',
'app_install_overwrite' =>
array (
0 => 'flow_notifications',
),
);
The output of your Apache/nginx/system log in /var/log/____:
no error/empty