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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 
Docker image: linuxserver/nextcloud b776fa42ef10 2024/01/30
Nextcloud version (eg, 20.0.5): 28.0.1.1
Operating system and version (eg, Ubuntu 20.04): Alpine Linux v3.18
Apache or nginx version (eg, Apache 2.4.25): nginx/1.24.0
PHP version (eg, 7.4): 8.2.13
The issue you are facing:
This error keeps coming up:
I don’t care about the file, I have a backup. I just want to get rid of this sync error message.
Maybe it is relevant: the Musik folder is external storage and not meant to be changed - so my expectation would have been an error like: no permission to move/copy file there.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- move a file twice to a nextcloud folder while having network connection issues
actually not sure if this replicates the error - its just what I did before this error appeared.
The output of your Nextcloud log in Admin > Logging:
Error jsresourceloader
Could not find resource files_external/js/public_key.js to load
21.03.2024, 18:27:30
Error jsresourceloader
Could not find resource files_external/js/oauth2.js to load
21.03.2024, 18:27:30
Error jsresourceloader
Could not find resource files_external/js/oauth1.js to load
21.03.2024, 18:27:30
Error jsresourceloader
Could not find resource files_external/js/public_key.js to load
21.03.2024, 18:27:30
Error jsresourceloader
Could not find resource files_external/js/oauth2.js to load
21.03.2024, 18:27:30
Error jsresourceloader
Could not find resource files_external/js/oauth1.js to load
21.03.2024, 18:27:30
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'memcache.local' => '\\OC\\Memcache\\APCu',
'datadirectory' => '/data',
'instanceid' => '***',
'passwordsalt' => '***+',
'secret' => '***',
'trusted_domains' =>
array (
1 => '***',
),
'trusted_proxies' =>
array (
0 => '192.168.1.4',
),
'overwritewebroot' => '/nextcloud',
'dbtype' => 'mysql',
'version' => '28.0.1.1',
'overwrite.cli.url' => 'https://***/nextcloud',
'dbname' => 'nextcloud',
'dbhost' => 'nextcloud_db',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextclouduser',
'dbpassword' => '***',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_sendmailmode' => 'pipe',
'mail_smtphost' => 'smtp.gmail.com',
'mail_smtpport' => '587',
'mail_from_address' => 'nextcloud',
'mail_domain' => '***',
'mail_smtpauth' => 1,
'mail_smtpname' => '***@googlemail.com',
'mail_smtppassword' => '***',
'loglevel' => 0,
'maintenance' => false,
'filelocking.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\APCu',
'upgrade.disable-web' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
root@77f58451ee19:/var/log/nginx# ls -la
total 12
drwxr-xr-x 1 abc abc 4096 Jan 31 16:05 .
drwxr-xr-x 1 root root 4096 Jan 30 12:56 ..
-rw-r--r-- 1 root root 0 Jan 31 16:05 error.log
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.
root@77f58451ee19:/var/www# find . -print
.
./localhost
./localhost/htdocs