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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
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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, 18.0.2): 20.0.3
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04 LTS
Linux 5.4.0-60-generic x86_64
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.41
PHP version (eg, 7.1): 7.4.3
The issue you are facing:
Hello, I have recently installed Nextcloud VM from Hansson IT.
It seems to work well with downloads.
But there are issues with uploads.
While uploading large files (1 GB and more) sometimes it fails.
I have set loglevel 0, but the only usefull message from nextcloud.log seems to be this:
“Expected filesize of 7176596992 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 5592825856 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.”
I have already tried changing the following parameters in php.ini:
upload_max_filesize = 50G
post_max_size = 50G
memory_limit = 2048M
Also I disabled chunking in Nextcloud.
It did not help.
Is there anything else I should try?
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- upload a file via web-interface
- after some time receive error message
The output of your Nextcloud log in Admin > Logging:
{"reqId":"jK21zbxDeeKne5Awu6dE","level":3,"time":"2021-01-13T12:33:37+03:00","remoteAddr":"1.2.3.4","user":"user1","app":"no app in context","method":"PUT","url":"/remote.php/webdav/Buh30_backup_2021_01_13_010602_6878268.bak","message":{"Exception":"Sabre\\DAV\\Exception\\BadRequest","Message":"Expected filesize of 7195471360 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 6110658560 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.","Code":0,"Trace":[{"file":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php","line":155,"function":"put","class":"OCA\\DAV\\Connector\\Sabre\\File","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1104,"function":"createFile","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":527,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":474,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":251,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":319,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v1/webdav.php","line":84,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":167,"args":["/var/www/nextcloud/apps/dav/appinfo/v1/webdav.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/File.php","Line":246,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36","version":"20.0.3.2"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'passwordsalt' => '',
'secret' => '',
'trusted_domains' =>
array (
0 => 'localhost',
1 => '5.6.7.8',
2 => '4.3.2.1',
),
'datadirectory' => '/mnt/ncdata',
'skeletondirectory' => '',
'dbtype' => 'pgsql',
'version' => '20.0.3.2',
'overwrite.cli.url' => 'http://localhost/',
'dbname' => 'nextcloud_db',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'ncadmin',
'dbpassword' => '',
'installed' => true,
'instanceid' => '',
'upgrade.disable-web' => 'true',
'log_type' => 'file',
'logfile' => '/var/log/nextcloud/nextcloud.log',
'loglevel' => '0',
'log.condition' =>
array (
'apps' =>
array (
0 => 'admin_audit',
),
),
'mail_smtpmode' => 'smtp',
'remember_login_cookie_lifetime' => '1800',
'log_rotate_size' => '504857600',
'trashbin_retention_obligation' => 'auto, 180',
'versions_retention_obligation' => 'auto, 365',
'simpleSignUpLink.shown' => false,
'memcache.local' => '\\OC\\Memcache\\APCu',
'filelocking.enabled' => true,
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 0.5,
'dbindex' => 0,
'password' => '0rvLHtxQKxEtlEdg1MrEDrDZE4N4',
),
'logtimezone' => 'Europe/Moscow',
'htaccess.RewriteBase' => '/',
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'maintenance' => false,
);
The output of your Apache/nginx/system log in /var/log/____:
[Wed Jan 13 12:13:00.338716 2021] [mpm_event:notice] [pid 1036:tid 139622946147392] AH00489: Apache/2.4.41 (Ubuntu) OpenSSL/1.1.1f configured -- resuming normal operations
[Wed Jan 13 12:13:00.340680 2021] [core:notice] [pid 1036:tid 139622946147392] AH00094: Command line: '/usr/sbin/apache2'