The Basics
- Nextcloud Server version (e.g., 29.x.x):
- 31.0.4
- Operating system and version (e.g., Ubuntu 24.04):
- Windows 11
- When did this problem seem to first start?
- after moving images from onedrive to nextcloud folder
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
- no
Summary of the issue you are facing:
Hi all, after moving my image folders from onedrive to Nexcloud, and did choose to “save space” for that folder because it is insanely huge and on my client I’d like download only the images I need, I noticed the image thumbnails (that I use to choose which image I wanna download) shows only for some images, but not all (a lot of them are without).
Can you please point me out on which settings/procedure/checks I have to perform to see if I did something wrong somewhere?
I tried installing preview generator but the issue didn’t solved.
The server is a turnkey-nextcloud image and I have access to its admin if needed. TIA!!!
Steps to replicate it (hint: details matter!):
- install turnkey-nextcloud image on a proxmox server and configure it to run baremetal with minimal changes
- install NC client on windows 11
- after successful first sync, move image folders to NC
- open local folder on windows 11
- I can see only an handful of thumbnails for all the images I have
- install and configure preview generator app
- still no thumbnails
Configuration
Nextcloud
The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):
root@nuvola ~# turnkey-occ config:list system
{
"system": {
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"localhost",
"***REMOVED SENSITIVE VALUE***",
"192.168.87.209",
"192.168.137.1"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "31.0.4.1",
"overwrite.cli.url": "http:\/\/localhost",
"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***",
"memcache.local": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 0,
"timeout": 0
},
"filelocking.enabled": true,
"memcache.locking": "\\OC\\Memcache\\Redis",
"log_type": "file",
"logfile": "\/var\/nextcloud-data\/nextcloud.log",
"loglevel": 2,
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_smtpmode": "sendmail",
"mail_sendmailmode": "smtp",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "25",
"mail_smtpauth": 1,
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"mail_smtpsecure": "ssl",
"maintenance": false,
"theme": "",
"maintenance_window_start": 2,
"default_phone_region": "IT",
"updater.secret": "***REMOVED SENSITIVE VALUE***",
"forbidden_filename_basenames": [
"con",
"prn",
"aux",
"nul",
"com0",
"com1",
"com2",
"com3",
"com4",
"com5",
"com6",
"com7",
"com8",
"com9",
"com\u00b9",
"com\u00b2",
"com\u00b3",
"lpt0",
"lpt1",
"lpt2",
"lpt3",
"lpt4",
"lpt5",
"lpt6",
"lpt7",
"lpt8",
"lpt9",
"lpt\u00b9",
"lpt\u00b2",
"lpt\u00b3"
],
"forbidden_filename_characters": [
"<",
">",
":",
"\"",
"|",
"?",
"*",
"\\",
"\/"
],
"forbidden_filename_extensions": [
" ",
".",
".filepart",
".part"
],
"enable_previews": true,
"preview_max_x": 256,
"preview_max_y": 256
}
}
Apps
The output of occ app:list (if possible).
root@nuvola ~# turnkey-occ app:list
Enabled:
- app_api: 5.0.2
- bruteforcesettings: 4.0.0
- cloud_federation_api: 1.14.0
- contactsinteraction: 1.12.0
- dashboard: 7.11.0
- dav: 1.33.0
- federatedfilesharing: 1.21.0
- files: 2.3.1
- files_downloadlimit: 4.0.0
- files_reminders: 1.4.0
- files_sharing: 1.23.1
- files_trashbin: 1.21.0
- files_versions: 1.24.0
- firstrunwizard: 4.0.0
- logreader: 4.0.0
- lookup_server_connector: 1.19.0
- nextcloud_announcements: 3.0.0
- notifications: 4.0.0
- oauth2: 1.19.1
- password_policy: 3.0.0
- photos: 4.0.0-dev.1
- previewgenerator: 5.8.0
- privacy: 3.0.0
- profile: 1.0.0
- provisioning_api: 1.21.0
- serverinfo: 3.0.0
- settings: 1.14.0
- sharebymail: 1.21.0
- support: 3.0.0
- text: 5.0.0
- theming: 2.6.1
- twofactor_backupcodes: 1.20.0
- updatenotification: 1.21.0
- viewer: 4.0.0
- webhook_listeners: 1.2.0
- workflowengine: 2.13.0
Disabled: - activity: 4.0.0 (installed 2.21.1)
- admin_audit: 1.21.0
- circles: 31.0.0 (installed 29.0.0-dev)
- comments: 1.21.0 (installed 1.19.0)
- encryption: 2.19.0
- federation: 1.21.0 (installed 1.19.0)
- files_external: 1.23.0
- files_pdfviewer: 4.0.0 (installed 2.10.0)
- recommendations: 4.0.0 (installed 2.1.0)
- related_resources: 2.0.0 (installed 1.4.0)
- survey_client: 3.0.0 (installed 1.17.0)
- suspicious_login: 9.0.1
- systemtags: 1.21.1 (installed 1.19.0)
- twofactor_nextcloud_notification: 5.0.0
- twofactor_totp: 13.0.0-dev.0
- user_ldap: 1.22.0
- user_status: 1.11.0 (installed 1.9.0)
- weather_status: 1.11.0 (installed 1.9.0)
root@nuvola ~#
Recommended setup: A Proxmox VM running Ubuntu Server 24.04 with Nextcloud All-in-One (AIO) installed via Docker offers a much more stable and compatible environment.
In this setup, thumbnail generation for image files works perfectly out of the box — no tweaks or manual fixes needed.