Download pdf file from browser doesn´t work

Hello! I have found a problem when trying to download a file (e.g. a PDF file) from the ownCloud installation, via web, logged in as a user with permissions to view and download.

Steps to reproduce

  1. Log in to your ownCloud installation visiting the URL (https://www.xxxxx.xx) with any browser (I have tried Chrome, Edge, Firefox)
  2. Open a PDF file and try to download it using the top right button.

Expected behaviour

It should download the file.

Actual behaviour

It doesnt download the file.

Server configuration

Operating system:
Ubuntu 18.04.5 LTS (GNU/Linux 4.15.0 x86_64)
Web server:
Apache
Database:
mysql Ver 15.1 Distrib 10.5.8-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
PHP version:
PHP 7.4.15 (cli) (built: Feb 14 2021 14:19:46) ( NTS )
Copyright © The PHP Group
Zend Engine v3.4.0, Copyright © Zend Technologies
with Zend OPcache v7.4.15, Copyright ©, by Zend Technologies
ownCloud version: (see ownCloud admin page)
10.6.0.5
Updated from an older ownCloud or fresh install:
Fresh install
Where did you install ownCloud from:
Source
Signing status (ownCloud 9.0 and above):

Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results into https://gist.github.com/ and puth the link here.

The content of config/config.php:

Log in to the web-UI with an administrator account and click on
'admin' -> 'Generate Config Report' -> 'Download ownCloud config report'
This report includes the config.php settings, the list of activated apps
and other details in a well sanitized form.

or 

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your ownCloud installation folder

*ATTENTION:* Do not post your config.php file in public as is. Please use one of the above
methods whenever possible. Both, the generated reports from the web-ui and from occ config:list
consistently remove sensitive data. You still may want to review the report before sending.
If done manually then it is critical for your own privacy to dilligently
remove *all* host names, passwords, usernames, salts and other credentials before posting.
You should assume that attackers find such information and will use them against your systems.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your ownCloud installation folder.

Are you using external storage, if yes which one: local/smb/sftp/…

Are you using encryption: yes/no

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/…

LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your ownCloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';


Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration

Browser:
Microsoft Edge Versión 89.0.774.54 (Compilación oficial) (64 bits)
Firefox 86.0.1 (64-bit)
Operating system:
Windows 10 Home

Logs

Web server error log

Insert your webserver log here

ownCloud log (data/owncloud.log)

Insert your ownCloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log 
c) ...

When I enter “download pdf” into this forum’s search function I receive the following post as the first result:

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