Support intro
Sorry to hear you’re facing problems. 
The community help forum (help.nextcloud.com) is for home and non-enterprise users. Support is provided by other community members on a best effort / “as available” basis. All of those responding are volunteering their time to help you.
If you’re using Nextcloud in a business/critical setting, paid and SLA-based support services can be accessed via portal.nextcloud.com where Nextcloud engineers can help ensure your business keeps running smoothly.
Getting help
In order to help you as efficiently (and quickly!) as possible, please fill in as much of the below requested information as you can.
Before clicking submit: Please check if your query is already addressed via the following resources:
- most of office issues are handled in Collabora integration guide
- Official documentation (searchable and regularly updated)
- How to topics and FAQs
- Forum search
(Utilizing these existing resources is typically faster. It also helps reduce the load on our generous volunteers while elevating the signal to noise ratio of the forums otherwise arising from the same queries being posted repeatedly).
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. 
The Basics
- Nextcloud Server version (e.g., 29.x.x):
32.0.3
- Operating system and version (e.g., Ubuntu 24.04):
Ubuntu 24.04
- Web server and version (e.g, Apache 2.4.25):
Apache 2.4.58
- Reverse proxy and version _(e.g. nginx 1.27.2)
(none)
- PHP version (e.g, 8.3):
8.4
- Is this the first time you’ve seen this error? (Yes / No):
yes
- When did this problem seem to first start?
(unknown)
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
bare metal
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
no
Summary of the issue you are facing:
When I try to insert an image from Nextcloud to a document, it always says “Unknown image format”:
It also doesn’t matter which format the image has. JPG, PNG - none works.
However, inserting a local image works fine.
Collabora 25.04.8.1 runs in a Docker container.
Steps to replicate it (hint: details matter!):
-
Create a Nextcloud office new text document and open it.
-
Click in “Insert Image” → “Insert image …” (or “Insert” → “Image …” in the compact view menu).
-
Select an image stored in Nextcloud.
-
Click “Insert file”
-
See the error.
Log entries
There none - neither in the browser console, nor in the Nextcloud server log.
Nextcloud
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!):
<?php
$CONFIG = array (
'instanceid' => 'xxxx',
'passwordsalt' => 'xxxx',
'secret' => 'xxxx',
'trusted_domains' =>
array (
0 => 'xxxx',
),
'datadirectory' => '/mnt/nextcloud-data',
'skeletondirectory' => '',
'overwrite.cli.url' => 'xxxx',
'dbtype' => 'mysql',
'version' => '32.0.3.2',
'installed' => true,
'htaccess.RewriteBase' => '/',
'maintenance' => false,
'dbname' => 'xxxx',
'dbhost' => 'xxxx',
'dbuser' => 'xxxx',
'dbpassword' => 'xxxx',
'dbpersistent' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'filelocking.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/run/redis/redis-server.sock',
'port' => 0,
'dbindex' => 0,
),
'knowledgebaseenabled' => false,
'theme' => '',
'simpleSignUpLink.shown' => false,
'loglevel' => 2,
'log_authfailip' => true,
'mysql.utf8mb4' => true,
'mail_from_address' => 'xxxx',
'mail_domain' => 'xxxx',
'mail_smtpmode' => 'sendmail',
'mail_smtphost' => 'xxxx',
'mail_smtpsecure' => 'ssl',
'mail_smtpname' => 'xxxx',
'mail_smtppassword' => 'xxxx',
'updater.release.channel' => 'stable',
'trashbin_retention_obligation' => 'auto, 30',
'versions_retention_obligation' => 'auto, 180',
'has_rebuilt_cache' => true,
'default_language' => 'de',
'default_phone_region' => 'DE',
'check_data_directory_permissions' => false,
'log_rotate_size' => 10485760,
'profile.enabled' => false,
'preview_max_x' => 1920,
'preview_max_y' => 1920,
'mail_sendmailmode' => 'smtp',
'mail_smtpauth' => true,
'mail_smtpport' => '465',
'trusted_proxies' =>
array (
0 => 'xxxx',
1 => 'xxxx',
2 => '127.0.0.1',
3 => '::1',
),
'auth.bruteforce.protection.enabled' => true,
'ratelimit.protection.enabled' => true,
'reference_opengraph' => false,
'integrity.check.disabled' => false,
'defaultapp' => 'files',
'maintenance_window_start' => 22,
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/nextcloud/apps',
'url' => '/apps',
'writable' => true,
),
),
'app_install_overwrite' =>
array (
),
'forbidden_filename_characters' =>
array (
0 => '\\',
1 => '/',
),
'forbidden_filename_extensions' =>
array (
0 => '.filepart',
1 => '.part',
),
'memories.db.triggers.fcu' => true,
'memories.exiftool' => '/var/www/nextcloud/apps/memories/bin-ext/exiftool-amd64-glibc',
'memories.vod.path' => '/var/www/nextcloud/apps/memories/bin-ext/go-vod-amd64',
'memories.index.path.blacklist' => 'xxxx',
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\PNG',
1 => 'OC\\Preview\\JPEG',
2 => 'OC\\Preview\\GIF',
3 => 'OC\\Preview\\HEIC',
4 => 'OC\\Preview\\BMP',
5 => 'OC\\Preview\\XBitmap',
6 => 'OC\\Preview\\MP3',
7 => 'OC\\Preview\\TXT',
8 => 'OC\\Preview\\MarkDown',
9 => 'OC\\Preview\\Movie',
10 => 'OC\\Preview\\MKV',
11 => 'OC\\Preview\\MP4',
12 => 'OC\\Preview\\AVI',
13 => 'OC\\Preview\\Image',
14 => 'OC\\Preview\\Imaginary',
),
'dbtableprefix' => 'oc_',
'memories.gis_type' => 1,
'memories.vod.ffmpeg' => '/usr/bin/ffmpeg',
'memories.vod.ffprobe' => '/usr/bin/ffprobe',
'enable_previews' => true,
'preview_imaginary_url' => 'http://127.0.0.1:9000',
);
Apps
The output of occ app:list (if possible).
Enabled:
- activity: 5.0.0-dev.0
- admin_audit: 1.22.0
- app_api: 32.0.0
- bookmarks: 16.0.1
- bruteforcesettings: 5.0.0-dev.0
- calendar: 6.1.4
- circles: 32.0.0
- cloud_federation_api: 1.16.0
- collectives: 3.5.0
- comments: 1.22.0
- contacts: 8.2.1
- contactsinteraction: 1.13.1
- dav: 1.34.2
- dav_push: 1.0.0
- deck: 1.16.3
- drawio: 3.1.2
- external: 7.0.0
- federatedfilesharing: 1.22.0
- federation: 1.22.0
- files: 2.4.0
- files_downloadlimit: 5.0.0-dev.0
- files_pdfviewer: 5.0.0-dev.0
- files_reminders: 1.5.0
- files_sharing: 1.24.1
- files_trashbin: 1.22.0
- files_versions: 1.25.0
- flow_notifications: 3.0.0
- impersonate: 3.0.1
- logcleaner: 1.2.3
- logreader: 5.0.0-dev.0
- lookup_server_connector: 1.20.0
- memories: 7.7.0
- nextcloud_announcements: 4.0.0-dev.0
- notes: 4.12.4
- notifications: 5.0.0-dev.0
- notify_push: 1.3.0
- oauth2: 1.20.0
- password_policy: 4.0.0-dev.0
- photos: 5.0.0-dev.1
- previewgenerator: 5.11.0
- privacy: 4.0.0-dev.0
- profile: 1.1.0
- provisioning_api: 1.22.0
- richdocuments: 9.0.2
- serverinfo: 4.0.0-dev.0
- settings: 1.15.1
- sharebymail: 1.22.0
- spreed: 22.0.7
- support: 4.0.0-dev.0
- survey_client: 4.0.0-dev.0
- systemtags: 1.22.0
- text: 6.0.1
- theming: 2.7.0
- theming_customcss: 1.19.0
- twofactor_backupcodes: 1.21.0
- twofactor_webauthn: 2.4.1
- updatenotification: 1.22.0
- viewer: 5.0.0-dev.0
- webhook_listeners: 1.3.0
- whiteboard: 1.5.1
- workflowengine: 2.14.0
Disabled:
- dashboard: 7.12.0 (installed 7.8.0)
- dicomviewer: 2.3.1 (installed 2.3.1)
- encryption: 2.20.0 (installed 2.13.0)
- files_external: 1.24.0 (installed 1.19.0)
- firstrunwizard: 5.0.0-dev.0 (installed 5.0.0-dev.0)
- jsloader: 2.0.0 (installed 2.0.0)
- recommendations: 5.0.0-dev.0 (installed 0.4.0)
- related_resources: 3.0.0-dev.0 (installed 1.1.0-alpha1)
- suspicious_login: 10.0.0-dev.0
- twofactor_nextcloud_notification: 6.0.0-dev.0
- twofactor_totp: 14.0.0
- user_ldap: 1.23.0
- user_status: 1.12.0 (installed 1.5.0)
- weather_status: 1.12.0 (installed 1.3.0)
Tips for increasing the likelihood of a response
- Use the
preformatted textformatting option in the editor for all log entries and configuration output. - If screenshots are useful, feel free to include them.
- If possible, also include key error output in text form so it can be searched for.
- Try to edit log output only minimally (if at all) so that it can be ran through analyzers / formatters by those trying to help you.
