File attributes get lost when uploaded to a external SMB/CIFS share

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

When using SMB share as external storage and one does upload a file via any endpoint (browser/desktop app/ios app) to that share, file attributes change.

Steps to reproduce

1. Configure a SMB/CIFS share as external storage
2. upload a file, e.g. a photo to that share
3. check the file attribute of the uploaded photo on the SMB share, learn that the date/time of last modified is set to the time when uploaded to the share, not date/time when you took the photo, as the file had before.
4. feel annoyed of that behavior, because your photo library is a mess now...

My setup: nextcloud latest stable, nginx, mysql, tested using desktop app, ios app and firefox as client.

Expected behavior

Leave file attributes untouched, like any other smb client using that same share does.

Nextcloud Server version

30

Operating system

Debian/Ubuntu

PHP engine version

None

Web server

Nginx

Database engine version

MySQL

Is this bug present after an update or on a fresh install?

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

occ config:list system:

{
"system": {
"passwordsalt": "REMOVED SENSITIVE VALUE",
"secret": "REMOVED SENSITIVE VALUE",
"trusted_domains": [
"XXXXX"
],
"datadirectory": "REMOVED SENSITIVE VALUE",
"dbtype": "mysql",
"version": "30.0.0.14",
"overwrite.cli.url": "https://nc.humph.ddnss.de",
"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",
"overwritehost": "XXXXXX",
"activity_expire_days": 14,
"allow_local_remote_servers": true,
"auth.bruteforce.protection.enabled": true,
"forbidden_filenames": [
".htaccess",
"Thumbs.db",
"thumbs.db"
],
"cron_log": true,
"default_phone_region": "XX",
"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",
"OC\Preview\HEIC",
"OC\Preview\Movie",
"OC\Preview\MKV",
"OC\Preview\MP4",
"OC\Preview\AVI"
],
"filesystem_check_changes": 0,
"filelocking.enabled": "true",
"htaccess.RewriteBase": "/",
"integrity.check.disabled": false,
"knowledgebaseenabled": false,
"log_rotate_size": "104857600",
"logfile": "/var/log/nextcloud/nextcloud.log",
"loglevel": 2,
"logtimezone": "XXXXX",
"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,
"profile.enabled": false,
"redis": {
"host": "REMOVED SENSITIVE VALUE",
"port": 0,
"password": "REMOVED SENSITIVE VALUE",
"timeout": 0.5,
"dbindex": 1
},
"quota_include_external_storage": false,
"share_folder": "/Shared",
"skeletondirectory": "",
"trashbin_retention_obligation": "auto, 7",
"maintenance_window_start": 1,
"maintenance": false,
"mail_from_address": "REMOVED SENSITIVE VALUE",
"mail_smtpmode": "smtp",
"mail_sendmailmode": "smtp",
"mail_domain": "REMOVED SENSITIVE VALUE",
"mail_smtphost": "REMOVED SENSITIVE VALUE",
"mail_smtpport": "587",
"mail_smtpauth": 1,
"mail_smtpname": "REMOVED SENSITIVE VALUE",
"mail_smtppassword": "REMOVED SENSITIVE VALUE",
"auto_logout": true

List of activated Apps

occ app:list:

Enabled:

• activity: 3.0.0
• admin_audit: 1.20.0
• bruteforcesettings: 3.0.0
• calendar: 5.0.0
• circles: 30.0.0-dev
• cloud_federation_api: 1.13.0
• comments: 1.20.1
• contacts: 6.1.0
• contactsinteraction: 1.11.0
• dashboard: 7.10.0
• dav: 1.31.1
• federatedfilesharing: 1.20.0
• files: 2.2.0
• files_downloadlimit: 3.0.0
• files_external: 1.22.0
• files_pdfviewer: 3.0.0
• files_reminders: 1.3.0
• files_sharing: 1.22.0
• files_trashbin: 1.20.1
• files_versions: 1.23.0
• groupfolders: 18.0.2
• lookup_server_connector: 1.18.0
• mail: 4.0.1
• nextcloud_announcements: 2.0.0
• notifications: 3.0.0
• oauth2: 1.18.1
• password_policy: 2.0.0
• passwords: 2024.9.20
• photos: 3.0.2
• privacy: 2.0.0
• provisioning_api: 1.20.0
• recommendations: 3.0.0
• related_resources: 1.5.0
• richdocuments: 8.5.1
• richdocumentscode: 24.4.802
• serverinfo: 2.0.0
• settings: 1.13.0
• sharebymail: 1.20.0
• spreed: 20.0.1
• systemtags: 1.20.0
• text: 4.1.0
• theming: 2.5.0
• twofactor_backupcodes: 1.19.0
• twofactor_totp: 12.0.0-dev
• updatenotification: 1.20.0
• user_status: 1.10.0
• viewer: 3.0.0
• weather_status: 1.10.0
• webhook_listeners: 1.1.0-dev
• workflowengine: 2.12.0
  Disabled:
• encryption: 2.18.0
• federation: 1.20.0 (installed 1.20.0)
• firstrunwizard: 3.0.0 (installed 3.0.0)
• logreader: 3.0.0 (installed 3.0.0)
• support: 2.0.0 (installed 2.0.0)
• survey_client: 2.0.0 (installed 2.0.0)
• suspicious_login: 8.0.0
• twofactor_nextcloud_notification: 4.0.0
• user_ldap: 1.21.

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

No response

Additional info

No response

Start by tracing the external-storage SMB upload path in the Nextcloud server and reproduce the upload using the reported browser, desktop, or iOS flow. Compare the uploaded file's modification time with the source file; done means the SMB copy preserves the source file attributes without regressing other uploads.