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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, 20.0.5): 28.0.1
Operating system and version (eg, Ubuntu 20.04): Linuxserver Docker @ Unraid
Apache or nginx version (eg, Apache 2.4.25): nginx 1.24.0
PHP version (eg, 7.4): 8.2
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- Login to Webinterface
- Upload a file > 6 GB
=> The upload is finished to 100% and stored temporarily in
/data/Username/upload/web-file-upload-4fb801ecf98d6dea
During copying from this temporary folder to destination folder, the copy process is terminated after 5-6 GB with the error messages below from webdav (why webdav??)
Already adapted settings:
nextcloud.ini: (php settings)
memory_limit=8G
upload_max_filesize=100G
post_max_size=100G
max_input_time=86400
max_execution_time=86400
output_buffering=0
always_populate_raw_post_data=-1
nginx default.conf:
fastcgi_read_timeout 3600;
fastcgi_send_timeout 3600;
fastcgi_connect_timeout 3600;
proxy_connect_timeout 3600;
proxy_send_timeout 3600;
proxy_read_timeout 3600;
send_timeout 3600;
The output of your Nextcloud log in Admin > Logging:
ServiceUnavailable
Datei konnte nicht geöffnet werden
/config/www/nextcloud/apps/dav/lib/Upload/AssemblyStream.php
Zeile 294
OCA\DAV\Connector\Sabre\File->get()
/config/www/nextcloud/apps/dav/lib/Upload/AssemblyStream.php
Zeile 164
OCA\DAV\Upload\AssemblyStream->getStream()
OCA\DAV\Upload\AssemblyStream->stream_read()
/config/www/nextcloud/apps/files_external/3rdparty/icewind/streams/src/Wrapper.php
Zeile 55
undefinedundefinedfread()
/config/www/nextcloud/apps/files_external/3rdparty/icewind/streams/src/CallbackWrapper.php
Zeile 96
Icewind\Streams\Wrapper->stream_read()
Icewind\Streams\CallbackWrapper->stream_read()
/app/www/public/lib/private/Files/Storage/Local.php
Zeile 335
undefinedundefinedfile_put_contents()
/app/www/public/lib/private/Files/Storage/Local.php
Zeile 643
OC\Files\Storage\Local->file_put_contents()
/app/www/public/lib/private/Files/Storage/Wrapper/Wrapper.php
Zeile 644
OC\Files\Storage\Local->writeStream()
/config/www/nextcloud/apps/dav/lib/Connector/Sabre/File.php
Zeile 250
OC\Files\Storage\Wrapper\Wrapper->writeStream()
/config/www/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php
Zeile 148
OCA\DAV\Connector\Sabre\File->put()
/app/www/public/3rdparty/sabre/dav/lib/DAV/Tree.php
Zeile 313
OCA\DAV\Connector\Sabre\Directory->createFile(
"*** sensitive parameters replaced ***"
)
/app/www/public/3rdparty/sabre/dav/lib/DAV/Tree.php
Zeile 139
Sabre\DAV\Tree->copyNode()
/app/www/public/3rdparty/sabre/dav/lib/DAV/Tree.php
Zeile 169
Sabre\DAV\Tree->copy()
/config/www/nextcloud/apps/dav/lib/Upload/ChunkingPlugin.php
Zeile 94
Sabre\DAV\Tree->move()
/config/www/nextcloud/apps/dav/lib/Upload/ChunkingPlugin.php
Zeile 76
OCA\DAV\Upload\ChunkingPlugin->performMove()
/app/www/public/3rdparty/sabre/event/lib/WildcardEmitterTrait.php
Zeile 89
OCA\DAV\Upload\ChunkingPlugin->beforeMove()
/app/www/public/3rdparty/sabre/dav/lib/DAV/CorePlugin.php
Zeile 603
Sabre\DAV\Server->emit()
/app/www/public/3rdparty/sabre/event/lib/WildcardEmitterTrait.php
Zeile 89
Sabre\DAV\CorePlugin->httpMove()
/app/www/public/3rdparty/sabre/dav/lib/DAV/Server.php
Zeile 472
Sabre\DAV\Server->emit()
/app/www/public/3rdparty/sabre/dav/lib/DAV/Server.php
Zeile 253
Sabre\DAV\Server->invokeMethod()
/app/www/public/3rdparty/sabre/dav/lib/DAV/Server.php
Zeile 321
Sabre\DAV\Server->start()
/config/www/nextcloud/apps/dav/lib/Server.php
Zeile 370
Sabre\DAV\Server->exec()
/config/www/nextcloud/apps/dav/appinfo/v2/remote.php
Zeile 35
OCA\DAV\Server->exec()
/app/www/public/remote.php
Zeile 172
undefinedundefinedrequire_once(
"/config/www/nextcloud/apps/dav/appinfo/v2/remote.php"
)
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'datadirectory' => '/data',
'instanceid' => '<myinstanceid>',
'passwordsalt' => '<mypassword>',
'secret' => '<mysecret>',
'trusted_domains' =>
array (
1 => 'mydomain.com',
),
'dbtype' => 'pgsql',
'version' => '28.0.1.1',
'overwrite.cli.url' => 'https://terra.local:8008',
'dbname' => 'nextcloud',
'dbhost' => 'db',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => '<username>',
'dbpassword' => '<password>',
'installed' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'filelocking.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\APCu',
'upgrade.disable-web' => true,
'default_phone_region' => 'DE',
);