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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:
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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): 20.0.10
Operating system and version (eg, Ubuntu 20.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): nginx 1.17.5
PHP version (eg, 7.4): 7.3.27-9
The issue you are facing:
Logged error message when executing file scan on SFTP external storage
Expected behavior: Update Nextcloud with the contents of external storage location
Actual behavior: Logged error message: “App:core, Message:Can’t get app storage, app files_external, user not logged in”
Is this the first time you’ve seen this error? (Y/N): I don’t recall this error being logged before upgrading to Nextcloud 20
Steps to replicate it:
- Create External Storage connection, using SFTP
- Execute ‘sudo -u www-data php occ files:scan --all’ or ‘sudo -u www-data php occ files:scan --path="[user]/files/[external_storage_mountpoint]"’
The output of your Nextcloud log in Admin > Logging:
{"reqId":"UhC3GUBUGaRXmGzP9jMu","level":3,"time":"2021-06-12T12:28:29-04:00","remoteAddr":"","user":"--","app":"core","method":"","url":"--","message":"Can't get app storage, app files_external, user not logged in","userAgent":"--","version":"20.0.10.1"}
{"reqId":"UhC3GUBUGaRXmGzP9jMu","level":3,"time":"2021-06-12T12:28:29-04:00","remoteAddr":"","user":"--","app":"core","method":"","url":"--","message":"Can't get app storage, app files_external, user not logged in","userAgent":"--","version":"20.0.10.1"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
{
"system": {
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"localhost",
"starkhome.org",
"nextcloud.starkhome.org",
"192.168.1.100"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "20.0.10.1",
"overwrite.cli.url": "https:\/\/starkhome.org",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"instanceid": "***REMOVED SENSITIVE VALUE***",
"activity_expire_days": 14,
"auth.bruteforce.protection.enabled": true,
"blacklisted_files": [
".htaccess",
"Thumbs.db",
"thumbs.db"
],
"cron_log": true,
"enable_previews": true,
"enabledPreviewProviders": [
"OC\\Preview\\PNG",
"OC\\Preview\\JPEG",
"OC\\Preview\\GIF",
"OC\\Preview\\BMP",
"OC\\Preview\\XBitmap",
"OC\\Preview\\Movie",
"OC\\Preview\\PDF",
"OC\\Preview\\MP3",
"OC\\Preview\\TXT",
"OC\\Preview\\MarkDown"
],
"filesystem_check_changes": 0,
"filelocking.enabled": "true",
"htaccess.RewriteBase": "\/",
"integrity.check.disabled": false,
"knowledgebaseenabled": false,
"logfile": "\/var\/nc_data\/nextcloud.log",
"loglevel": 2,
"logtimezone": "America\/New_York",
"log_rotate_size": 104857600,
"maintenance": false,
"memcache.local": "\\OC\\Memcache\\APCu",
"memcache.locking": "\\OC\\Memcache\\Redis",
"overwriteprotocol": "https",
"preview_max_x": 1024,
"preview_max_y": 768,
"preview_max_scale_factor": 1,
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 0,
"timeout": 0
},
"quota_include_external_storage": false,
"share_folder": "\/",
"skeletondirectory": "",
"theme": "",
"trashbin_retention_obligation": "auto, 7",
"updater.release.channel": "stable",
"mail_smtpmode": "smtp",
"mail_smtpsecure": "ssl",
"mail_sendmailmode": "smtp",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtpauthtype": "LOGIN",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"app_install_overwrite": [
"calendar"
],
"mail_smtpport": "465",
"mail_smtpauth": 1,
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***"
}
}
The output of your Apache/nginx/system log in /var/log/____:
2021/06/12 12:27:56 [error] 8468#8468: r3.o.lencr.org could not be resolved (3: Host not found) while requesting certificate status, responder: r3.o.lencr.org, certificate: "/etc/letsencrypt/live/***REMOVED SENSITIVE VALUE***/fullchain.pem"
