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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, 12.0.2): 15.02
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04.1 virtualized on Windows server 2016
Apache or nginx version (eg, Apache 2.4.25): nginx 1.14.0
PHP version (eg, 7.1): php 7.2.14
The issue you are facing:
When attempting to view a .mp4 file in a desktop browser I receive the following error: The video could not be loaded, either because the server or network failed or because the format is not supported. This occurs for files over 400 MB.
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
- open nextcloud in different browsers result the same.
- same thing occurs on the mobile version
The output of your Nextcloud log in Admin > Logging:
[PHP] Error: fseek(): stream does not support seeking at /var/www/nextcloud/apps/files_external/3rdparty/icewind/streams/src/Wrapper.php#82
GET /remote.php/webdav/DaCrew/Video/2014_10%20-%20DaCrew%20Ocho%20Rios/MAH00033.MP4
from ***.***.***.*** by claymca at 2019-01-23T05:04:46+00:00
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'occu4tz5yj3a',
'passwordsalt' => 'asbLuxzDlx2Cb++WEdT3Ydr/cqu9fR',
'secret' => 'pALRjVx8gyDBr73g4rOIC4viLpGeGs3sDTCpzvBtr4H3inHh',
'trusted_domains' =>
array (
0 => 'localhost',
1 => 'xxx.xxx.xxx.xxx',
2 => '*******.ddns.net',
),
'datadirectory' => '/var/www/nextcloud/data',
'dbtype' => 'mysql',
'version' => '15.0.2.0',
'overwrite.cli.url' => 'http://xxx.xxx.xxx.xxx',
'dbname' => 'nextcloud_db',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxxxxxxxxx',
'dbpassword' => xxxxxxxxxxxxx',
'installed' => true,
'mail_from_address' => 'xxxxxxxxxxxx',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => 'xxxxxx.xxxt',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtpname' => 'xxxxxxxxxxxx',
'mail_smtppassword' => 'xxxxxxxxxx',
'mail_smtphost' => 'xxxxx.xxxxxxxx.xxx',
'mail_smtpport' => '587',
'maintenance' => false,
'loglevel' => 2,
'enable_previews' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
),
);
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE