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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): 22.1.1
Operating system and version (eg, Ubuntu 20.04): TrueNAS-12.0-U5.1
Apache or nginx version (eg, Apache 2.4.25): nginx/1.20.1
PHP version (eg, 7.4): PHP 7.4.23
The issue you are facing:
I use nextcloud to automatically upload the pictures of my iphone.
When i open the pictures folder, i see the uploaded pictures that were uploaded a few moments ago, but not the older pictures.
Another thing that happens is, that nextcloud has alot of cpu usage ranging from 50-100%.
This lasts for about a minute.
In the browser on my pc all pictures are shown as normal.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Open Nextcloud ios app
- Navigate to pictures folder
The output of your Nextcloud log in Admin > Logging:
Info no app in context Deprecated event type for OCP\IDBConnection::CHECK_MISSING_COLUMNS: Symfony\Component\EventDispatcher\GenericEvent is used
2021-09-12T08:57:28+0200
Info no app in context Deprecated event type for OCP\IDBConnection::CHECK_MISSING_INDEXES: Symfony\Component\EventDispatcher\GenericEvent is used
2021-09-12T08:57:27+0200
Info no app in context Deprecated event type for OCP\IDBConnection::CHECK_MISSING_PRIMARY_KEYS: Symfony\Component\EventDispatcher\GenericEvent is used
2021-09-12T08:57:26+0200
Info no app in context Deprecated event type for OCP\IDBConnection::CHECK_MISSING_COLUMNS: Symfony\Component\EventDispatcher\GenericEvent is used
2021-09-12T08:52:21+0200
Info no app in context Deprecated event type for OCP\IDBConnection::CHECK_MISSING_INDEXES: Symfony\Component\EventDispatcher\GenericEvent is used
2021-09-12T08:52:20+0200
Info no app in context Deprecated event type for OCP\IDBConnection::CHECK_MISSING_PRIMARY_KEYS: Symfony\Component\EventDispatcher\GenericEvent is used
2021-09-12T08:52:19+0200
Info no app in context Symfony\Component\Routing\Exception\RouteNotFoundException: Unable to generate a URL for the named route "ocs.password_policy.API.validate" as such route does not exist.
2021-09-12T08:48:25+0200
Info no app in context Symfony\Component\Routing\Exception\RouteNotFoundException: Unable to generate a URL for the named route "ocs.password_policy.API.generate" as such route does not exist.
2021-09-12T08:48:25+0200
Info core Trusted domain error. "192.241.214.68" tried to access using "ipaddress" as host.
2021-09-12T08:48:25+0200
Info no app in context Deprecated event type for OCP\IDBConnection::CHECK_MISSING_COLUMNS: Symfony\Component\EventDispatcher\GenericEvent is used
2021-09-12T08:36:09+0200
Info no app in context Deprecated event type for OCP\IDBConnection::CHECK_MISSING_INDEXES: Symfony\Component\EventDispatcher\GenericEvent is used
2021-09-12T08:36:08+0200
Info no app in context Deprecated event type for OCP\IDBConnection::CHECK_MISSING_PRIMARY_KEYS: Symfony\Component\EventDispatcher\GenericEvent is used
2021-09-12T08:36:05+0200
The output of your config.php file in /usr/local/www/nextcloud/config (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'apps_paths' =>
array (
0 =>
array (
'path' => '/usr/local/www/nextcloud/apps',
'url' => '/apps',
'writable' => true,
),
1 =>
array (
'path' => '/usr/local/www/nextcloud/apps-pkg',
'url' => '/apps-pkg',
'writable' => true,
),
),
'logfile' => '/var/log/nextcloud/nextcloud.log',
'memcache.local' => '\\OC\\Memcache\\APCu',
'passwordsalt' => 'removed',
'secret' => 'removed',
'trusted_domains' =>
array (
0 => 'localhost',
1 => '192.168.178.155',
2 => 'nextcloud.mydomain.de',
3 => 'cloud.mydomain.de',
),
'datadirectory' => '/usr/local/www/nextcloud/data',
'dbtype' => 'mysql',
'version' => '22.1.1.2',
'overwrite.cli.url' => 'http://localhost',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'oc_ncadmin',
'dbpassword' => 'removed',
'installed' => true,
'instanceid' => 'removed',
'theme' => '',
'loglevel' => 1,
'maintenance' => false,
);
The output of your Apache/nginx/system log in /var/log/____:
2021/09/12 08:45:42 [warn] 100#101373: *35 an upstream response is buffered to a temporary file /var/tmp/nginx/fastcgi_temp/1/00/0000000001 while reading upstream, client: myipadress, server: *.mydomain.de, request: "GET /index.php/core/preview.png?file=Photos/21-09-10%2014-49-01%202487.jpg&x=1024&y=1024&a=1&mode=cover HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:45:43 [warn] 100#101373: *35 an upstream response is buffered to a temporary file /var/tmp/nginx/fastcgi_temp/2/00/0000000002 while reading upstream, client: myipadress, server: *.mydomain.de, request: "GET /index.php/core/preview.png?file=Photos/21-09-10%2015-00-39%202488.jpg&x=1024&y=1024&a=1&mode=cover HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:45:45 [warn] 100#101373: *35 an upstream response is buffered to a temporary file /var/tmp/nginx/fastcgi_temp/3/00/0000000003 while reading upstream, client: myipadress, server: *.mydomain.de, request: "GET /index.php/core/preview.png?file=Photos/21-09-10%2015-17-52%202490.jpg&x=1024&y=1024&a=1&mode=cover HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:45:46 [warn] 100#101373: *35 an upstream response is buffered to a temporary file /var/tmp/nginx/fastcgi_temp/4/00/0000000004 while reading upstream, client: myipadress, server: *.mydomain.de, request: "GET /index.php/core/preview.png?file=Photos/21-09-10%2017-43-33%202491.jpg&x=1024&y=1024&a=1&mode=cover HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:45:58 [warn] 100#101373: *35 an upstream response is buffered to a temporary file /var/tmp/nginx/fastcgi_temp/5/00/0000000005 while reading upstream, client: myipadress, server: *.mydomain.de, request: "GET /index.php/core/preview.png?file=Photos/21-09-10%2022-49-38%202495.jpg&x=1024&y=1024&a=1&mode=cover HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:46:03 [warn] 100#101373: *35 an upstream response is buffered to a temporary file /var/tmp/nginx/fastcgi_temp/6/00/0000000006 while reading upstream, client: myipadress, server: *.mydomain.de, request: "GET /index.php/core/preview.png?file=Photos/21-09-11%2000-52-23%202497.jpg&x=1024&y=1024&a=1&mode=cover HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:46:12 [warn] 100#101373: *35 an upstream response is buffered to a temporary file /var/tmp/nginx/fastcgi_temp/7/00/0000000007 while reading upstream, client: myipadress, server: *.mydomain.de, request: "GET /index.php/core/preview.png?file=Photos/21-09-11%2010-31-38%202502.jpg&x=1024&y=1024&a=1&mode=cover HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:46:12 [warn] 100#101373: *35 an upstream response is buffered to a temporary file /var/tmp/nginx/fastcgi_temp/8/00/0000000008 while reading upstream, client: myipadress, server: *.mydomain.de, request: "GET /index.php/core/preview.png?file=Photos/21-09-11%2012-00-29%202504.jpg&x=1024&y=1024&a=1&mode=cover HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:46:39 [error] 100#101373: *35 upstream timed out (60: Operation timed out) while reading response header from upstream, client: myipadress, server: *.mydomain.de, request: "PROPFIND /remote.php/webdav/Photos/ HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:46:47 [error] 100#101373: *35 upstream timed out (60: Operation timed out) while reading response header from upstream, client: myipadress, server: *.mydomain.de, request: "PROPFIND /remote.php/webdav/Photos/ HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock", host: "nextcloud.mydomain.de:8443"
2021/09/12 08:46:51 [warn] 100#101373: *35 an upstream response is buffered to a temporary file /var/tmp/nginx/fastcgi_temp/9/00/0000000009 while reading upstream, client: myipadress, server: *.mydomain.de, request: "GET /index.php/core/preview.png?file=Photos/21-09-11%2012-58-52%202509.jpg&x=1024&y=1024&a=1&mode=cover HTTP/2.0", upstream: "fastcgi://unix:/var/run/nextcloud-php-fpm.sock:", host: "nextcloud.mydomain.de:8443"