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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, 18.0.2): 18.0.4.2
Operating system and version (eg, Ubuntu 20.04): Debian Stretch
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.25
PHP version (eg, 7.1): 7.3
The issue you are facing:
I can download a single file just fine, but when i click the checkbox and go to Actions I can’t download anything.
Is this the first time you’ve seen this error? (Y/N):
No, it’s 100% reproducible.
Steps to replicate it:
- Select any file with the checkbox
- Go to Download
- Redirection to index.php without any error whatsoever
The output of your Nextcloud log in Admin > Logging:
Not much really, only some deprecation events
{"reqId":"DuCncpEadQD9bh9cvBBL","level":0,"time":"May 06, 2020 19:13:19","remoteAddr":"","user":"user","app":"no app in context","method":"GET","url":"/index.php/core/preview?fileId=124234&x=32&y=32","message":"Deprecated event type for \\OCP\\Files::postWrite: Symfony\\Component\\EventDispatcher\\GenericEvent","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36","version":"18.0.4.2"}
{"reqId":"RUrORyRZjiUDkHl35ipr","level":0,"time":"May 06, 2020 19:13:22","remoteAddr":"","user":"user","app":"no app in context","method":"GET","url":"/index.php/apps/files/","message":"Deprecated event type for OCA\\Files::loadAdditionalScripts: Symfony\\Component\\EventDispatcher\\GenericEvent","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36","version":"18.0.4.2"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
{
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
***REMOVED SENSITIVE VALUE***
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "18.0.4.2",
"overwrite.cli.url": "https:\/\/cloud.simon-mueller.de",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"mail_smtpmode": "smtp",
"mail_smtpsecure": "tls",
"mail_sendmailmode": "smtp",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtpauthtype": "LOGIN",
"mail_smtpauth": 1,
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"mysql.utf8mb4": true,
"maintenance": false,
"theme": "",
"logdateformat": "F d, Y H:i:s",
"filelocking.enabled": true,
"filelocking.ttl": 300,
"memcache.local": "\\OC\\Memcache\\APCu",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 0,
"timeout": 0
},
"log_rotate_size": "10485760",
"trashbin_retention_obligation": "auto, 180",
"versions_retention_obligation": "auto, 365"
}
The output of your Apache/nginx/system log in /var/log/____:
/var/log/apache2/cloud.simon-mueller.de ssl_access_ssl.log:10421:I:P:V:6 - - [06/May/2020:20:37:08 +0200] "GET /index.php/apps/files/ajax/download.php?dir=%2F&files=test&downloadStartSecret=changedHTTP/1.1" 302 - "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36" /var/log/apache2/cloud.simon-mueller.de ssl_access_ssl.log-10422-I:P:V:6 - - [06/May/2020:20:37:08 +0200] "GET /index.php/apps/files/ HTTP/1.1" 200 9462 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36"
Any help is appreciated.
I have tested this on official nextcloud demo and it works there, so it’s not a client/browser issue.
