FTP upload: Getting error message when using PHP 8.0.7^ but file is uploaded

I´m getting the following error when uploading a file via FTP adapter

#0 [internal function]: Illuminate\Foundation\Bootstrap\HandleExceptions->handleError()
#1 C:\inetpub\wwwroot\vendor\league\flysystem\src\Adapter\Ftp.php(273): ftp_fput()
#2 C:\inetpub\wwwroot\vendor\league\flysystem\src\Filesystem.php(123): League\Flysystem\Adapter\Ftp->writeStream()
#3 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Filesystem\FilesystemAdapter.php(248): League\Flysystem\Filesystem->putStream()
#4 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Filesystem\FilesystemAdapter.php(284): Illuminate\Filesystem\FilesystemAdapter->put()
#5 C:\inetpub\wwwroot\app\Classes\Document.php(155): Illuminate\Filesystem\FilesystemAdapter->putFileAs()
#6 C:\inetpub\wwwroot\app\Http\Controllers\DocumentController.php(26): App\Classes\Document::confirm()
#7 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\Controller.php(54): App\Http\Controllers\DocumentController->uploadDocumentConfirm()
#8 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\ControllerDispatcher.php(45): Illuminate\Routing\Controller->callAction()
#9 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\Route.php(262): Illuminate\Routing\ControllerDispatcher->dispatch()
#10 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\Route.php(205): Illuminate\Routing\Route->runController()
#11 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\Router.php(695): Illuminate\Routing\Route->run()
#12 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(128): Illuminate\Routing\Router->Illuminate\Routing\{closure}()
#13 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\Middleware\SubstituteBindings.php(50): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#14 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Routing\Middleware\SubstituteBindings->handle()
#15 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Auth\Middleware\Authenticate.php(44): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#16 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Auth\Middleware\Authenticate->handle()
#17 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Middleware\VerifyCsrfToken.php(78): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#18 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Foundation\Http\Middleware\VerifyCsrfToken->handle()
#19 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\View\Middleware\ShareErrorsFromSession.php(49): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#20 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\View\Middleware\ShareErrorsFromSession->handle()
#21 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Session\Middleware\StartSession.php(121): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#22 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Session\Middleware\StartSession.php(64): Illuminate\Session\Middleware\StartSession->handleStatefulRequest()
#23 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Session\Middleware\StartSession->handle()
#24 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse.php(37): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#25 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse->handle()
#26 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Cookie\Middleware\EncryptCookies.php(67): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#27 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Cookie\Middleware\EncryptCookies->handle()
#28 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(103): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#29 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\Router.php(697): Illuminate\Pipeline\Pipeline->then()
#30 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\Router.php(672): Illuminate\Routing\Router->runRouteWithinStack()
#31 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\Router.php(636): Illuminate\Routing\Router->runRoute()
#32 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Routing\Router.php(625): Illuminate\Routing\Router->dispatchToRoute()
#33 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Kernel.php(167): Illuminate\Routing\Router->dispatch()
#34 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(128): Illuminate\Foundation\Http\Kernel->Illuminate\Foundation\Http\{closure}()
#35 C:\inetpub\wwwroot\app\Http\Middleware\IsMobile.php(31): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#36 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): App\Http\Middleware\IsMobile->handle()
#37 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Middleware\TransformsRequest.php(21): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#38 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull.php(31): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle()
#39 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull->handle()
#40 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Middleware\TransformsRequest.php(21): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#41 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Middleware\TrimStrings.php(40): Illuminate\Foundation\Http\Middleware\TransformsRequest->handle()
#42 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Foundation\Http\Middleware\TrimStrings->handle()
#43 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Middleware\ValidatePostSize.php(27): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#44 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Foundation\Http\Middleware\ValidatePostSize->handle()
#45 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Middleware\PreventRequestsDuringMaintenance.php(86): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#46 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Illuminate\Foundation\Http\Middleware\PreventRequestsDuringMaintenance->handle()
#47 C:\inetpub\wwwroot\vendor\fruitcake\laravel-cors\src\HandleCors.php(38): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#48 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Fruitcake\Cors\HandleCors->handle()
#49 C:\inetpub\wwwroot\vendor\fideloper\proxy\src\TrustProxies.php(57): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#50 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(167): Fideloper\Proxy\TrustProxies->handle()
#51 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(103): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}()
#52 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Kernel.php(142): Illuminate\Pipeline\Pipeline->then()
#53 C:\inetpub\wwwroot\vendor\laravel\framework\src\Illuminate\Foundation\Http\Kernel.php(111): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter()
#54 C:\inetpub\wwwroot\public\index.php(52): Illuminate\Foundation\Http\Kernel->handle()
#55 {main}ftp_fput(): A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

The funny thing is that the file is actually uploaded.

It works fine without returning any error when using PHP 8.0.2, I've tried using versions 8.0.7, 8.1 and 8.1.1 and it always returns this error.

Any idea why is this happening?