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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): 25.0.3
Operating system and version (eg, Ubuntu 20.04): Rocky Linux 8.7
Apache or nginx version (eg, Apache 2.4.25): openresty/1.19.9.1
PHP version (eg, 7.4): 8.1.16
The issue you are facing:
I can upload and download files over 1G if I sign in with a user created via nextcloud both internally on my LAN and externally
When I created a link that has full permissions for a share I can download files over 1G but if I drag and drop it will complete then say “failed unexpected error occurred” but if it’s under 1G like a 979MB file it will complete fine
Tested with multiple files and clients, different shares broswers all with the same issue
for some background this is running on a rocky linux storage server running ZFS with a dataset that’s serving out SMB to clients, I have external storage configured with SFTP in nextcloud pointing to the same dataset, same issue occurred with SMB, and it’s available for all users
I don’t think it’s a network issue because of what was mentioned above, I feel like it’s a config file somewhere or a setting i’m missing
Here is a snippet of the load and resources available
and some more info on php
Is this the first time you’ve seen this error? (Y/N): No
Steps to replicate it:
- create a shared link from a folder on nextcloud webui with full access
- copy link and access in web broswer
- drag and drop any file over 1G and it’ll fail
The output of your Nextcloud log in Admin > Logging:
Error no app in context Sabre\DAV\Exception\BadRequest: Expected filesize of 3091660800 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. 2023-12-22T12:45:16-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:45:16-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:45:16-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:43:43-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:43:43-0600
Error no app in context Sabre\DAV\Exception\BadRequest: Expected filesize of 1215168512 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. 2023-12-22T12:37:50-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:37:50-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:37:50-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:34:19-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:34:19-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:34:18-0600
Error core Can't get app storage, app files_external, user not logged in 2023-12-22T12:34:18-0600
-----
Error no app in context Sabre\DAV\Exception\BadRequest: Expected filesize of 1215168512 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.
/var/www/html/apps/dav/lib/Connector/Sabre/Directory.php - line 151:
OCA\DAV\Connector\Sabre\File->put(null)
/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php - line 1098:
OCA\DAV\Connector\Sabre\Directory->createFile("ubuntu-20.0 ... o", null)
/var/www/html/3rdparty/sabre/dav/lib/DAV/CorePlugin.php - line 504:
Sabre\DAV\Server->createFile("ubuntu-20.0 ... o", null, null)
/var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php - line 89:
Sabre\DAV\CorePlugin->httpPut(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php - line 472:
Sabre\DAV\Server->emit("method:PUT", [ Sabre\HTTP ... }])
/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php - line 253:
Sabre\DAV\Server->invokeMethod(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php - line 321:
Sabre\DAV\Server->start()
/var/www/html/apps/dav/appinfo/v1/publicwebdav.php - line 123:
Sabre\DAV\Server->exec()
/var/www/html/public.php - line 80:
require_once("/var/www/ht ... p")
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'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' => 'oc9zlc33a619',
'passwordsalt' => 'advi1fA88by28QgC/w5ql1UjsJZnRX',
'secret' => 'v0tNtVX+5iHMQONKV9bGYdZSO0PwNpZybOzkH5JP0P9a6nnm',
'trusted_domains' =>
array (
0 => 'x.x.x.x',
1 => 'x.x.x.x',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'mysql',
'version' => '25.0.3.2',
'overwrite.cli.url' => 'http://x.x.x.x',
'dbname' => 'nextcloud',
'dbhost' => 'nextcloud-db',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'user',
'dbpassword' => 'user_password',
'installed' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
[root@docker-4e1a43293c37:/var/log/nginx]# cat error.log
2023/12/22 13:53:38 [notice] 350#350: signal process started
2023/12/22 14:53:38 [notice] 412#412: signal process started
2023/12/22 15:53:38 [notice] 473#473: signal process started
2023/12/22 16:51:26 [notice] 530#530: signal process started
2023/12/22 16:51:48 [notice] 591#591: signal process started
2023/12/22 16:53:38 [notice] 652#652: signal process started
2023/12/22 17:53:38 [notice] 713#713: signal process started
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
https://pastebin.com/VVPNSQV9