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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): 27.0.1
Operating system and version (eg, Ubuntu 20.04): Debian 12
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.57
PHP version (eg, 7.4): 8.2
The issue you are facing: Unable to connect Nextcloud with OnlyOffice
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Install OnlyOffice plugin
- Introduce my OnlyOffice server ip and secret
- Click connect
The output of your Nextcloud log in Admin > Logging:
Error onlyoffice Exception: Se ha producido un error en el servicio de documentos: Error while downloading the document file to be converted.
/var/www/html/nextcloud/apps/onlyoffice/lib/DocumentService.php - line 95:
OCA\Onlyoffice\DocumentService->ProcessConvServResponceError()
/var/www/html/nextcloud/apps/onlyoffice/lib/DocumentService.php - line 446:
OCA\Onlyoffice\DocumentService->GetConvertedUri()
/var/www/html/nextcloud/apps/onlyoffice/lib/Controller/SettingsController.php - line 176:
OCA\Onlyoffice\DocumentService->checkDocServiceUrl()
/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 230:
OCA\Onlyoffice\Controller\SettingsController->SaveAddress()
/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 137:
OC\AppFramework\Http\Dispatcher->executeController()
/var/www/html/nextcloud/lib/private/AppFramework/App.php - line 183:
OC\AppFramework\Http\Dispatcher->dispatch()
/var/www/html/nextcloud/lib/private/Route/Router.php - line 315:
OC\AppFramework\App::main()
/var/www/html/nextcloud/lib/base.php - line 1071:
OC\Route\Router->match()
/var/www/html/nextcloud/index.php - line 36:
OC::handleRequest()
2023-07-28T14:39:55+0200
Fatal onlyoffice Download empty without jwt
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxxxx',
'passwordsalt' => 'xxxxxx',
'secret' => 'xxxxx',
'trusted_domains' =>
array (
0 => 'xxxxx',
),
'datadirectory' => '/var/www/html/nextcloud/data',
'dbtype' => 'mysql',
'version' => '27.0.1.2',
'overwrite.cli.url' => 'xxxxx',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:3306',
'dbport' => '',
'lost_password_link' => 'xxxxx',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => 'xxxxx',
'installed' => true,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'updater.release.channel' => 'stable',
'app_install_overwrite' =>
array (
0 => 'externalpassword',
),
'onlyoffice' =>
array (
"jwt_secret" => "xxxxxx",
"jwt_header" => "Authorization"
),
);
The output of your Apache/nginx/system log in /var/log/____:
Empty
PASTE HERE
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.
Exception: Se ha producido un error en el servicio de documentos: Error while downloading the document file to be converted.