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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): replace me
Operating system and version (eg, Ubuntu 20.04): Linux 6.2.0-34-generic #34~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.57 (Unix) (fpm-fcgi)
PHP version (eg, 7.4): 8.1.23
The issue you are facing:
the image preview no longer loads/ loads for ever.
error i see in logging is Error PHP file_get_contents(/mnt/43016db9-8792-4bec-bb2b-9a4d204f46a9/backup/iphone/Readme.md): Failed to open stream: Permission denied at /var/www/html/lib/private/Files/Storage/Local.php#305
same on all devices i use.
using aio in docker on ubuntu, external storage is mounted, it was working earlier have not changed any config.
PS: very new to nextcloud and code in general, please assist.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- opening any photo causes issue
- unable to see any folders or pics on mobile devices, android or ios
The output of your Nextcloud log in Admin > Logging:
Error PHP file_get_contents(/mnt/43016db9-8792-4bec-bb2b-9a4d204f46a9/backup/iphone/Readme.md): Failed to open stream: Permission denied at /var/www/html/lib/private/Files/Storage/Local.php#305
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
{
"one-click-instance": true,
"one-click-instance.user-limit": 100,
"memcache.local": "\\OC\\Memcache\\APCu",
"apps_paths": [
{
"path": "\/var\/www\/html\/apps",
"url": "\/apps",
"writable": false
},
{
"path": "\/var\/www\/html\/custom_apps",
"url": "\/custom_apps",
"writable": true
}
],
"check_data_directory_permissions": false,
"memcache.distributed": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"password": "***REMOVED SENSITIVE VALUE***",
"port": xxxx
},
"overwritehost": "nextcloud.XXX.XX",
"overwriteprotocol": "https",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"localhost",
"nextcloud.XXX.XX""
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "pgsql",
"version": "27.1.0.7",
"overwrite.cli.url": "https:\/\/nextcloud.XXX.XX"\/",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"instanceid": "***REMOVED SENSITIVE VALUE***",
"maintenance": false,
"loglevel": "2",
"log_type": "file",
"logfile": "\/var\/www\/html\/data\/nextcloud.log",
"log_rotate_size": "10485760",
"log.condition": {
"apps": [
"admin_audit"
]
},
"preview_max_x": "2048",
"preview_max_y": "2048",
"jpeg_quality": "60",
"enabledPreviewProviders": {
"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",
"0": "OC\\Preview\\Imaginary"
},
"enable_previews": true,
"upgrade.disable-web": true,
"mail_smtpmode": "smtp",
"trashbin_retention_obligation": "auto, 30",
"versions_retention_obligation": "auto, 30",
"activity_expire_days": "30",
"simpleSignUpLink.shown": false,
"share_folder": "\/Shared",
"one-click-instance.link": "https:\/\/nextcloud.com\/all-in-one\/",
"upgrade.cli-upgrade-link": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/2726",
"updatedirectory": "\/nc-updater",
"davstorage.request_timeout": 3600,
"htaccess.RewriteBase": "\/",
"dbpersistent": true,
"files_external_allow_create_new_local": true,
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"preview_imaginary_url": "http:\/\/nextcloud-aio-imaginary:9000"
}
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