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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
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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): Nextcloud Hub 5 (27.0.0)
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04.2 LTS
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.52
PHP version (eg, 7.4): 8.1
The issue you are facing:
I created a folder named test in /var/www/html/nextcloud/admin/files with root permission and set its permission to 755. Then I created another folder called test2 in folder test, set test2’s permission to 777. Theoretically anyone could create, upload and delete files in folder test2, I thought.
Then I logged in NC as admin. Everything was fine. There was no issue when I was testing the folder test2. After that I shared the folder to another user called testuser , granting him full permission.
I logged in as testuser and found that I could create, delete and rename files or folders just as I thought previously. However, when I tried to upload some files in test2, I was told “Could not rename part file to final file”.
I did not encounter with the same issue when I logged in as admin. I do not know why.
Is there any difference in the upload process?
It is REALLY WEIRD…
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Create a folder with root permission and set it to 755.
- Create another folder in previous folder and set the new folder to 777.
- Share the folder in step 1 to anyone else in NC with full permission(). And the bug appears. The user being shared with can do anything in the 777 folder including creating new files EXCEPT uploading files. If you create a sharing link with full permission, there will be no problem when you attempting to upload files.
Make sure to use www-data to run NC.
The output of your Nextcloud log in Admin > Logging:
[webdav] Error: Sabre\DAV\Exception: Could not rename part file to final file at <<closure>>
0. /var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php line 149
OCA\DAV\Connector\Sabre\File->put()
1. /var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 1098
OCA\DAV\Connector\Sabre\Directory->createFile("*** sensitive parameters replaced ***")
2. /var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php line 504
Sabre\DAV\Server->createFile("*** sensitive parameters replaced ***")
3. /var/www/html/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php line 89
Sabre\DAV\CorePlugin->httpPut()
4. /var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 472
Sabre\DAV\Server->emit()
5. /var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 253
Sabre\DAV\Server->invokeMethod()
6. /var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 321
Sabre\DAV\Server->start()
7. /var/www/html/nextcloud/apps/dav/appinfo/v1/webdav.php line 85
Sabre\DAV\Server->exec()
8. /var/www/html/nextcloud/remote.php line 172
require_once("/var/www/html/n ... p")
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oco2vjrqy6nb',
'passwordsalt' => 'J1A0qP4lDwnp2gz3f+D2wJnBgCE8Ug',
'secret' => 'g+LhI4/ypfc9atUcAva1hK3UUsKnSLdMKdklw4YruTCOPKtZ',
'trusted_domains' =>
array (
0 => '192.168.235.128',
),
'datadirectory' => '/var/www/html/nextcloud/data',
'dbtype' => 'mysql',
'version' => '27.0.0.8',
'overwrite.cli.url' => 'http://192.168.235.128/nextcloud',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'oc_admin',
'dbpassword' => 'M*5Fl-:U5!T-(<kr1kQ3?a;|TNq-@#',
'installed' => true,
'allow_local_remote_servers' => true,
'filesystem_check_changes' => true,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
);
The output of your Apache/nginx/system log in /var/log/____:
192.168.235.1 - - [04/Jul/2023:02:58:32 +0000] "GET /nextcloud/index.php/apps/recommendations/api/recommendations HTTP/1.1" 200 1085 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.67"
192.168.235.1 - - [04/Jul/2023:02:58:32 +0000] "PROPFIND /nextcloud/remote.php/dav/files/admin/ HTTP/1.1" 207 1538 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.67"
192.168.235.1 - - [04/Jul/2023:02:58:33 +0000] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 1250 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.67"
192.168.235.1 - - [04/Jul/2023:02:58:33 +0000] "GET /nextcloud/index.php/apps/files/ajax/getstoragestats?dir=%2F HTTP/1.1" 200 12858 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.67"
192.168.235.1 - - [04/Jul/2023:02:58:35 +0000] "PUT /nextcloud/ocs/v2.php/apps/user_status/api/v1/heartbeat?format=json HTTP/1.1" 200 951 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36"
192.168.235.1 - - [04/Jul/2023:02:58:41 +0000] "PUT /nextcloud/remote.php/webdav/test/test2/%E8%A1%A5%E5%85%85N.txt HTTP/1.1" 500 771 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36"
192.168.235.1 - - [04/Jul/2023:02:58:28 +0000] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=HgewWxQUml60tKRaBsHY HTTP/1.1" 200 1625 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.67"
::1 - - [04/Jul/2023:02:58:41 +0000] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.4.52 (Ubuntu) (internal dummy connection)"
You may have a legitimate reason for doing so - that’s fine - but unless you describe it to us we’ll probably giving you inappropriate advice. 