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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, 20.0.5): 28.0.4
Operating system and version (eg, Ubuntu 20.04): Docker container
Apache or nginx version (eg, Apache 2.4.25): nginx 1.25.4
PHP version (eg, 7.4): 8.2.17
The issue you are facing:
- I sync my photos of my phone to my NAS via Syncthing
- UID/GID of the syncthing folder on my nas are www-data/www-data
- The Syncthing folder is shared via NFS and mounted to the nextcloud docker container (/syncthing) as a volume
- The /synchting folder is mounted as a local external storage in nextcloud
- I can browse the folder in nextcloud
- Memories can index it (php occ memories:index)
- I can see the photos indexed in the timeline
But in the logs, I have every 15 to 20 minutes the following error :
Failed to index folder /username/files/Syncthing: Local storage path does not exist “/syncthing/”
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
{
"reqId": "uSkskKbnmmUVmrG0Uera",
"level": 3,
"time": "2024-04-04T21:20:39+00:00",
"remoteAddr": "",
"user": "--",
"app": "memories",
"method": "",
"url": "--",
"message": "Failed to index folder /username/files/Syncthing: Local storage path does not exist \"/syncthing/\"",
"userAgent": "--",
"version": "28.0.4.1",
"data": {
"app": "memories"
},
"id": "660f1c309c1df"
}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'htaccess.RewriteBase' => '/',
'filelocking.enabled' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'redis',
'port' => 6379,
),
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'instanceid' => 'REDACTED',
'passwordsalt' => 'REDACTED',
'secret' => 'REDACTED',
'trusted_domains' =>
array (
0 => 'REDACTED',
),
'trusted_proxies' =>
array (
0 => 'REDACTED',
),
'datadirectory' => '/data',
'dbtype' => 'mysql',
'version' => '28.0.4.1',
'dbname' => 'REDACTED',
'dbhost' => 'REDACTED',
'dbport' => '',
'dbtableprefix' => '',
'dbuser' => 'REDACTED',
'dbpassword' => 'REDACTED',
'installed' => true,
'overwrite.cli.url' => 'REDACTED',
'overwriteprotocol' => 'https',
'log_type' => 'file',
'logfile' => '/logs/nextcloud.log',
'loglevel' => 2,
'maintenance' => false,
'trashbin_retention_obligation' => 'auto,30',
'versions_retention_obligation' => 'auto,30',
'mysql.utf8mb4' => true,
'theme' => '',
'twofactor_enforced' => 'false',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
'has_rebuilt_cache' => true,
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'default_phone_region' => 'FR',
'preview_concurrency_new' => '2',
'preview_concurrency_all' => '4',
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\Imaginary',
1 => 'OC\\Preview\\Image',
2 => 'OC\\Preview\\MarkDown',
3 => 'OC\\Preview\\MP3',
4 => 'OC\\Preview\\TXT',
5 => 'OC\\Preview\\OpenDocument',
6 => 'OC\\Preview\\Movie',
7 => 'OC\\Preview\\Krita',
),
'preview_imaginary_url' => 'REDACTED',
'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',
'preview_max_memory' => '256',
'memories.exiftool' => '/var/www/html/custom_apps/memories/bin-ext/exiftool-amd64-glibc',
'memories.vod.path' => '/var/www/html/custom_apps/memories/bin-ext/go-vod-amd64',
'memories.db.triggers.fcu' => true,
'maintenance_window_start' => 100,
);
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
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
Where does this error come from and how could I get rid of it?
Thanks.
) and found that those folders were messed up. I deleted them and the errors stopped occurring.