Unavailable SMB external storage blocks access to the entire file view

Login as admin user into your Nextcloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or 

Insert your config.php content here. 
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

Insert your webserver log here

{"reqId":"mBxfbezt8u5VVQkSpI2U","level":1,"time":"2021-10-27T13:26:14+00:00","remoteAddr":"xxx.xxx.xxx.xxx","user":"karagian","app":"lib","method":"PROPFIND","url":"/cs/remote.php/dav/files/karagian/","message":"Storage with shared::c3f884e09f90a4f4fb9ff44bfc071298 marked as unavailable","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0","version":"21.0.2.1"}
{"reqId":"mBxfbezt8u5VVQkSpI2U","level":4,"time":"2021-10-27T13:26:15+00:00","remoteAddr":"xxx.xxx.xxx.xxx","user":"karagian","app":"webdav","method":"PROPFIND","url":"/cs/remote.php/dav/files/karagian/","message":{"Exception":"Icewind\\SMB\\Exception\\InvalidArgumentException","Message":"Invalid request for / (InvalidArgumentException)","Code":22,"Trace":[{"file":"/var/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php","line":67,"function":"fromMap","class":"Icewind\\SMB\\Exception\\Exception","type":"::","args":[["Icewind\\SMB\\Exception\\ForbiddenException","Icewind\\SMB\\Exception\\NotFoundException","Icewind\\SMB\\Exception\\ForbiddenException","Icewind\\SMB\\Exception\\FileInUseException","Icewind\\SMB\\Exception\\AlreadyExistsException","And 11 more entries, set log level to debug to see all entries"],22,"/"]},{"file":"/var/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php","line":84,"function":"handleError","class":"Icewind\\SMB\\Native\\NativeState","type":"->","args":["/"]},{"file":"/var/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php","line":338,"function":"testResult","class":"Icewind\\SMB\\Native\\NativeState","type":"->","args":[false,"smb://127.0.0.1/COMMON/"]},{"file":"/var/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeShare.php","line":305,"function":"getxattr","class":"Icewind\\SMB\\Native\\NativeState","type":"->","args":["smb://127.0.0.1/COMMON/","system.dos_attr.*"]},{"file":"/var/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeFileInfo.php","line":43,"function":"getAttribute","class":"Icewind\\SMB\\Native\\NativeShare","type":"->","args":["/","system.dos_attr.*"]},{"file":"/var/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeFileInfo.php","line":69,"function":"stat","class":"Icewind\\SMB\\Native\\NativeFileInfo","type":"->","args":[]},{"file":"/var/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeShare.php","line":114,"function":"getSize","class":"Icewind\\SMB\\Native\\NativeFileInfo","type":"->","args":[]},{"file":"/var/nextcloud/apps/files_external/lib/Lib/Storage/SMB.php","line":193,"function":"stat","class":"Icewind\\SMB\\Native\\NativeShare","type":"->","args":["/"]},{"file":"/var/nextcloud/apps/files_external/lib/Lib/Storage/SMB.php","line":636,"function":"getFileInfo","class":"OCA\\Files_External\\Lib\\Storage\\SMB","type":"->","args":["/"]},{"file":"/var/nextcloud/lib/private/Files/Storage/Common.php","line":114,"function":"filetype","class":"OCA\\Files_External\\Lib\\Storage\\SMB","type":"->","args":["*** sensitive parameter replaced ***"]},{"file":"/var/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php","line":115,"function":"is_dir","class":"OC\\Files\\Storage\\Common","type":"->","args":["*** sensitive parameter replaced ***"]},{"file":"/var/nextcloud/lib/private/Files/Storage/Wrapper/Availability.php","line":132,"function":"is_dir","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->","args":["*** sensitive parameter replaced ***"]},{"file":"/var/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php","line":115,"function":"is_dir","class":"OC\\Files\\Storage\\Wrapper\\Availability","type":"->","args":["*** sensitive parameter replaced ***"]},{"file":"/var/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php","line":115,"function":"is_dir","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->","args":["*** sensitive parameter replaced ***"]},{"file":"/var/nextcloud/lib/private/Files/Storage/Wrapper/Wrapper.php","line":115,"function":"is_dir","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->","args":["*** sensitive parameter replaced ***"]},{"file":"/var/nextcloud/lib/private/Files/Cache/Watcher.php","line":105,"function":"is_dir","class":"OC\\Files\\Storage\\Wrapper\\Wrapper","type":"->","args":["*** sensitive parameter replaced ***"]},{"file":"/var/nextcloud/lib/private/Files/View.php","line":1350,"function":"update","class":"OC\\Files\\Cache\\Watcher","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/nextcloud/lib/private/Files/View.php","line":1390,"function":"getCacheEntry","class":"OC\\Files\\View","type":"->","args":[{"mountPoint":"/karagian/files/COMMON/","cache":{"__class__":"OC\\Files\\Cache\\Cache"},"scanner":{"__class__":"OC\\Files\\Cache\\Scanner"},"watcher":null,"propagator":null,"updater":null,"__class__":"OCA\\FilesAccessControl\\StorageWrapper"},"*** sensitive parameter replaced ***","/COMMON"]},{"file":"/var/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php","line":331,"function":"getFileInfo","class":"OC\\Files\\View","type":"->","args":["/karagian/files/COMMON",false]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":765,"function":"getQuotaInfo","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->","args":[]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/PropFind.php","line":95,"function":"Sabre\\DAV\\{closure}","class":"Sabre\\DAV\\CorePlugin","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":769,"function":"handle","class":"Sabre\\DAV\\PropFind","type":"->","args":["{DAV:}quota-available-bytes",{"__class__":"Closure"}]},{"file":"/var/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"propFind","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"__class__":"Sabre\\DAV\\PropFind"},{"__class__":"OCA\\DAV\\Connector\\Sabre\\Directory"}]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1052,"function":"emit","class":"Sabre\\DAV\\Server","type":"->","args":["propFind",[{"__class__":"Sabre\\DAV\\PropFind"},{"__class__":"OCA\\DAV\\Connector\\Sabre\\Directory"}]]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":984,"function":"getPropertiesByNode","class":"Sabre\\DAV\\Server","type":"->","args":[{"__class__":"Sabre\\DAV\\PropFind"},{"__class__":"OCA\\DAV\\Connector\\Sabre\\Directory"}]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1661,"function":"getPropertiesIteratorForPath","class":"Sabre\\DAV\\Server","type":"->","args":["files/karagian",["{DAV:}getlastmodified","{DAV:}getetag","{DAV:}getcontenttype","{DAV:}resourcetype","{http://owncloud.org/ns}fileid","And 14 more entries, set log level to debug to see all entries"],1]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1646,"function":"writeMultiStatus","class":"Sabre\\DAV\\Server","type":"->","args":[{"elementMap":[],"contextUri":"/cs/remote.php/dav/","namespaceMap":{"DAV:":"d","http://sabredav.org/ns":"s","http://owncloud.org/ns":"oc","http://nextcloud.org/ns":"nc"},"classMap":[],"__class__":"Sabre\\Xml\\Writer"},{"__class__":"Generator"},false]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":346,"function":"generateMultiStatus","class":"Sabre\\DAV\\Server","type":"->","args":[{"__class__":"Generator"},false]},{"file":"/var/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpPropFind","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":472,"function":"emit","class":"Sabre\\DAV\\Server","type":"->","args":["method:PROPFIND",[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":253,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"/var/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":321,"function":"start","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"/var/nextcloud/apps/dav/lib/Server.php","line":332,"function":"exec","class":"Sabre\\DAV\\Server","type":"->","args":[]},{"file":"/var/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"/var/nextcloud/remote.php","line":167,"args":["/var/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/nextcloud/apps/files_external/3rdparty/icewind/smb/src/Exception/Exception.php","Line":44,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0","version":"21.0.2.1"}

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...