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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, 29.0.5): 28.0.5.1
Operating system and version (eg, Ubuntu 29.04): Armbian-unofficial 24.2.1 Bookworm \l . 6.6.18-current-bcm2711 (aarch64)
Apache or nginx version (eg, Apache 2.4.25): replace me
PHP version (eg, 8.3): replace me
The issue you are facing:
Nextcloudpi version 1.54.0 new installation
data dir is located on external USB SSD and nc datadir points correctly to it
desktop client syncs OK
On mobile client I can access the data. I can delete exiting files and everything syncs but when trying to upload a file I get the following:
The same message appears repeatedly for every file trying to sync
Is this the first time you’ve seen this error? (Y/N):Y
Steps to replicate it:
- Fresh install
- setup using wizard
- create user
- Open ports on router ports forwarding
- Try to sync from mobile client
The output of your Nextcloud log in Admin > Logging:
the snapshot above repeats for every file trying to sync
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
$CONFIG = array (
'passwordsalt' => '****************',
'secret' => '*****************',
'trusted_domains' =>
array (
0 => 'localhost',
7 => 'nextcloudpi',
5 => 'nextcloudpi.local',
8 => 'nextcloudpi.lan',
3 => 'nextcloudpi',
11 => '*******my_public_ip',
1 => '192.168.0.103',
14 => 'nextcloudpi',
),
'datadirectory' => '/media/USBdrive/ncdata/data',
'dbtype' => 'mysql',
'version' => '28.0.5.1',
'overwrite.cli.url' => 'https://nextcloudpi/',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'ncadmin',
'dbpassword' => '***************',
'installed' => true,
'instanceid' => 'ocnb9vfp73bk',
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis.sock',
'port' => 0,
'timeout' => 0.0,
'password' => '*************',
),
'tempdirectory' => '/media/USBdrive/ncdata/data/tmp',
'mail_smtpmode' => 'sendmail',
'mail_smtpauthtype' => 'LOGIN',
'mail_from_address' => 'noreply',
'mail_domain' => 'nextcloudpi.com',
'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',
'overwriteprotocol' => 'https',
'maintenance' => false,
'logfile' => '/media/USBdrive/ncdata/data/nextcloud.log',
'trusted_proxies' =>
array (
11 => '127.0.0.1',
12 => '::1',
),
'loglevel' => '2',
'log_type' => 'file',
);
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
PASTE HERE[Tue Jun 11 01:34:12.847488 2024] [proxy_fcgi:error] [pid 314314:tid 281472124317984] [client 192.168.0.101:50650] AH01071: Got error 'PHP message:
PHP Notice: Unknown: file created in the system's temporary directory in Unknown on line 0PHP message: PHP Warning: Unknown: Unable to create temp
orary file, Check permissions in temporary files directory. in Unknown on line 0PHP message: PHP Warning: Unknown: POST data can't be buffered; all
data discarded in Unknown on line 0'
[Tue Jun 11 03:34:19.308461 2024] [proxy_fcgi:error] [pid 314314:tid 281473046724896] [client 192.168.0.101:53997] AH01071: Got error 'PHP message:
PHP Notice: Unknown: file created in the system's temporary directory in Unknown on line 0PHP message: PHP Warning: Unknown: Unable to create temp
orary file, Check permissions in temporary files directory. in Unknown on line 0PHP message: PHP Warning: Unknown: POST data can't be buffered; all
data discarded in Unknown on line 0'
[Tue Jun 11 03:34:19.421931 2024] [proxy_fcgi:error] [pid 314314:tid 281471721664800] [client 192.168.0.101:54000] AH01071: Got error 'PHP message:
PHP Notice: Unknown: file created in the system's temporary directory in Unknown on line 0PHP message: PHP Warning: Unknown: Unable to create temp
orary file, Check permissions in temporary files directory. in Unknown on line 0PHP message: PHP Warning: Unknown: POST data can't be buffered; all
data discarded in Unknown on line 0'
[Tue Jun 11 05:20:53.900169 2024] [proxy_fcgi:error] [pid 314314:tid 281472912716064] [client 192.168.0.101:57061] AH01071: Got error 'PHP message:
PHP Notice: Unknown: file created in the system's temporary directory in Unknown on line 0PHP message: PHP Warning: Unknown: Unable to create temp
orary file, Check permissions in temporary files directory. in Unknown on line 0PHP message: PHP Warning: Unknown: POST data can't be buffered; all
data discarded in Unknown on line 0'
[Tue Jun 11 05:20:54.092388 2024] [proxy_fcgi:error] [pid 314332:tid 281471939899680] [client 192.168.0.101:57064] AH01071: Got error 'PHP message:
PHP Notice: Unknown: file created in the system's temporary directory in Unknown on line 0PHP message: PHP Warning: Unknown: Unable to create temp
orary file, Check permissions in temporary files directory. in Unknown on line 0PHP message: PHP Warning: Unknown: POST data can't be buffered; all
data discarded in Unknown on line 0'