Question After update to Kunena to 6.0 (6.0.4) no attachments visible

After update of Kunena from version 5.2.9 in Joomla 3  to Joomla 4 version now 6.0.4 the attachments are all in the back-end listed under Kunena Forum Attachments but in the messages the attachments are shown under description of the attachmentnumber followed by "not found".
I have been looking to all configuration elements and the plugins but can find a change.
Who can help me to find a solution.

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htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 128M | Max file upload: 

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path	In trash
1132	Forum	mainmenu	view=home&defaultmenu=639	info/forum	No
2546	Forum	mainmenu	view=home&defaultmenu=973	leden/algemeen/forum	No
1121	Forum	kunenamenu	view=home&defaultmenu=1123	forum	No
1122	Index	kunenamenu	view=category&layout=list	forum/index	No
1123	Recente onderwerpen	kunenamenu	view=topics&mode=replies	forum/recent	No
1124	Ongelezen	kunenamenu	view=topics&layout=unread	forum/ongelezen	No
1125	Nieuw onderwerp	kunenamenu	view=topic&layout=create	forum/nieuw-onderwerp	No
1126	Geen antwoorden	kunenamenu	view=topics&mode=noreplies	forum/geen-antwoorden	No
1127	Mijn onderwerpen	kunenamenu	view=topics&layout=user&mode=default	forum/mijn-laatste	No
1128	Profiel	kunenamenu	view=user	forum/profiel	No
1130	Zoeken	kunenamenu	view=search	forum/zoeken	No
1129	Help	kunenamenu	view=misc	forum/help	No
1131	Forum	kunenamenu	view=home&defaultmenu=973	forum/kunena-2020-04-08	No

Joomla default template details : shaper_helixultimate | author: JoomShaper.com | version: 2.0.11 | creationdate: Feb 2018

Kunena default template details : Aurelia | author: Kunena Team | version: 6.0.4 | creationdate: 2022-10-30

Kunena template params:

Warning: Spoiler!

DefaultCategoryicon
profileIconset	default
DefaultIconset	default
editorIconset	default
bootstrap	0
borderless	1
tooltips	1
SubjectLengthMessage	80
fullactions	1
quick	0
displayMenu	1
displayDropdownMenu	1
displayDropdownContent	1
displayModule	1
displayBreadcrumb	1
displayAnnouncement	1
displayFooter	1
avatarPosition	left
formRecover	0
labels	0
whoisonlineName	both
avatarType	rounded
topicicontype	svg
fontawesome	0
socialshare	0
socialsharetag
socialtheme	classic
optional_username	1
writeaccess	0
localstorage	0
IconColor	inherit
IconColorNew	#185359
editorType	ckeditor
Bold	1
Italic	1
Underline	1
Strike	1
Subscript	0
Superscript	0
RemoveFormat	0
BulletedList	1
NumberedList	1
Blockquote	1
JustifyLeft	1
JustifyCenter	1
JustifyRight	1
JustifyBlock	0
Link_Unlink	1
Image	0
Smiley	1
Confidential	0
Hidetext	0
Spoiler	0
Code	0
Ebay	0
Twitter	0
Instagram	0
Soundcloud	0
FontSize	1
TextColor	1
Maximize	0
Map	1
Video	1
editorButtons	Superscript,Subscript,JustifyBlock,RemoveFormat,Confidential,Hidetext,Spoiler,Ebay,Twitter,Instagram,Soundcloud,Maximize,Image,Code
nameskinckeditor
ckeditorcustomprefixconfigfile
avatarSizeX	60
avatarSizeY	60
avatarSizeXThumb	60
avatarSizeYThumb	60
avatarSizeXWelcome	60
avatarSizeYWelcome	60
avatarSizeXList	60
avatarSizeYList	60
avatarSizeXPost	60
avatarSizeYPost	60
avatarSizeXProfile	20
avatarSizeYProfile	20
templatebyText
templatebyName
templatebyLink

Kunena version detailed: Kunena 6.0.4 | 2022-10-30 [ Git Repository ]
        | Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
boardOffline	0
enableRss	1
threadsPerPage	30
messagesPerPage	100
messagesPerPageSearch	15
showHistory	1
historyLimit	20
showNew	1
disableEmoticons	0
template	blue_eagle5
showAnnouncement	0
avatarOnCategory	0
showChildCatIcon	0
rteWidth	450
rteHeight	300
enableForumJump	1
reportMsg	1
username	0
askEmail	0
showEmail	0
showUserStats	0
showKarma	0
userEdit	1
userEditTime	0
userEditTimeGrace	600
editMarkup	1
allowSubscriptions	1
subscriptionsChecked	1
allowFavorites	1
maxSig	300
regOnly	0
pubWrite	0
floodProtection	0
mailModerators	0
mailAdministrators	0
captcha	0
mailFull	1
allowAvatarUpload	1
allowAvatarGallery	1
avatarQuality	75
avatarSize	20480
imageHeight	1000
imageWidth	800
imageSize	10000
fileTypes	video,txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2,docx,docs,xls,xlsx,pps,pptx,htm,,mov,mp4 ,pdf,
fileSize	12000
showRanking	0
rankImages	1
userlistRows	100
userlistOnline	1
userlistAvatar	0
userlistPosts	1
userlistKarma	0
userlistEmail	0
userlistJoinDate	0
userlistLastVisitDate	0
userlistUserHits	0
latestCategory	0
showStats	0
showWhoIsOnline	1
showGenStats	0
showPopUserStats	0
popUserCount	5
showPopSubjectStats	0
popSubjectCount	5
showSpoilerTag	1
showVideoTag	1
showEbayTag	1
trimLongUrls	0
trimLongUrlsFront	40
trimLongUrlsBack	20
autoEmbedYoutube	1
autoEmbedEbay	1
ebayLanguageCode	en-us
sessionTimeOut	1800
highlightCode	0
rssType	topic
rssTimeLimit	1 month
rssLimit	100
rssIncludedCategories
rssExcludedCategories
rssSpecification	rss2.0
rssAllowHtml	1
rssAuthorFormat	name
rssAuthorInTitle	1
rssWordCount	0
rssOldTitles	1
rssCache	0
defaultPage	recent
defaultSort	desc
sef	1
showImgForGuest	1
showFileForGuest	1
pollNbOptions	4
pollAllowVoteOne	1
pollEnabled	0
popPollsCount	5
showPopPollStats	0
pollTimeBtVotes	00:15:00
pollNbVotesByUser	100
pollResultsUserslist	1
allowUserEditPoll	0
maxPersonalText	50
orderingSystem	replyid
postDateFormat	datetime
postDateFormatHover	datetime
hideIp	1
imageTypes	jpg,jpeg,gif,png,mp4,mov,video,pdf,
checkMimeTypes	1
imageMimeTypes	image/jpeg,image/jpg,image/gif,image/png,image/mp4/mov,image/pdf
imageQuality	50
thumbHeight	50
thumbWidth	50
hideUserProfileInfo	put_empty
boxGhostMessage	1
userDeleteMessage	2
latestCategoryIn	0
topicIcons	1
debug	0
catsAutoSubscribed	0
showBannedReason	0
showThankYou	0
showPopThankYouStats	0
popThanksCount	5
modSeeDeleted	0
bbcodeImgSecure	image
listCatShowModerators	0
lightbox	2
showListTime	-1
showSessionType	1
showSessionStartTime	1800
userlistAllowed	0
userlistCountUsers	1
enableThreadedLayouts	0
categorySubscriptions	post
topicSubscriptions	disabled
pubProfile	0
thankYouMax	10
emailRecipientCount	50
emailRecipientPrivacy	bcc
captchaPostLimit	0
imageUpload	everybody
fileUpload	everybody
topicLayout	threaded
timeToCreatePage	0
showImgFilesManageProfile	1
holdNewUsersPosts	0
holdGuestPosts	0
attachmentLimit	15
pickupCategory	0
articleDisplay	full
sendEmails	1
fallbackEnglish	1
cache	0
cacheTime	60
ipTracking	0
rssFeedBurnerUrl
autoLink	0
accessComponent	1
statsLinkAllowed	0
superAdminUserlist	0
attachmentProtection	0
categoryIcons	1
avatarCrop	0
userReport	0
searchTime	365
teaser	0
ebayLanguage	0
ebayCertId
allowChangeSubject	1
maxLinks	10
readOnly	0
ratingEnabled	0
urlSubjectTopic	0
logModeration	0
attachStart	0
attachEnd	14
attachmentUtf8	1
autoEmbedSoundcloud	1
emailHeader	media/kunena/email/hero-wide.png
userStatus	0
signature	0
personal	0
social	0
plainEmail	0
moderatorPermDelete	1
avatarTypes	gif,jpeg,jpg,png
smartLinking	0
defaultAvatar	nophoto.png
defaultAvatarSmall	s_nophoto.png
quickReply	1
avatarEdit	0
activeMenuItem
mainMenuId
homeId
indexId
moderatorsId
topicListId
miscId
profileId
searchId
custom_id
avatarType	1
sefRedirect	1
allowEditPoll	1
useSystemEmails	0
autoEmbedInstagram	1
disableRe	0
email_sender_name
display_filename_attachment	0
new_users_prevent_post_url_images	0
minimal_user_posts_add_url_image	10
utmSource	0
emailHeaderSizeY	560
emailHeaderSizeX	560
moderator_id
profiler	0
pickup_category	0
board_title	Forum Klokkengroep 's-Hertogenbosch
board_offline	0
offline_message	The Forum is currently offline for maintenance. Check back soon!
enablerss	1
threads_per_page	30
messages_per_page	100
messages_per_page_search	15
showhistory	1
historylimit	20
shownew	1
disemoticons	0
showannouncement	0
avataroncat	1
catimagepath	category_images
showchildcaticon	0
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
askemail	0
showemail	0
showuserstats	0
showkarma	0
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
regonly	1
pubwrite	0
floodprotection	0
mailmod	0
mailadmin	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
avatarsize	20480
imageheight	600
imagewidth	500
imagesize	10000
filetypes	video,txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2,docx,docs,xls,xlsx,pps,pptx,htm,,mov,mp4 ,pdf,
filesize	12000
showranking	0
rankimages	1
userlist_rows	100
userlist_online	1
userlist_avatar	1
userlist_posts	1
userlist_karma	0
userlist_email	0
userlist_joindate	0
userlist_lastvisitdate	0
userlist_userhits	0
latestcategory	0
showstats	0
showwhoisonline	0
showgenstats	0
showpopuserstats	0
popusercount	5
showpopsubjectstats	0
popsubjectcount	5
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	topic
rss_timelimit	month
rss_limit	100
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
rss_author_format	name
rss_author_in_title	1
rss_word_count	0
rss_old_titles	1
rss_cache	900
defaultpage	recent
default_sort	asc
showimgforguest	1
showfileforguest	1
pollnboptions	4
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poppollscount	5
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polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	0
allow_user_edit_poll	0
maxpersotext	50
ordering_system	replyid
post_dateformat	datetime
post_dateformat_hover	datetime
hide_ip	1
imagetypes	jpg,jpeg,gif,png,mp4,mov,video,pdf,
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png,image/mp4/mov,image/pdf
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	1
userdeletetmessage	2
latestcategory_in	0
topicicons	1
catsautosubscribed	0
showbannedreason	0
showthankyou	0
showpopthankyoustats	0
popthankscount	5
mod_see_deleted	1
bbcode_img_secure	image
listcat_show_moderators	0
show_list_time	-1
show_session_type	1
show_session_starttime	1800
userlist_allowed	1
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	every
pubprofile	0
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
email_visible_address
captcha_post_limit	0
image_upload	registered
file_upload	registered
topic_layout	threaded
time_to_create_page	0
show_imgfiles_manage_profile	0
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	15
article_display	full
send_emails	1
fallback_english	1
cache_time	60
ebay_affiliate_id	5337089937
iptracking	1
rss_feedburner_url
autolink	0
access_component	1
statslink_allowed	0
superadmin_userlist	0
legacy_urls	1
attachment_protection	0
categoryicons	1
avatarresizemethod	1
avatarcrop	0
user_report	0
searchtime	365
ebay_language	0
ebay_api_key
twitter_consumer_key
twitter_consumer_secret
allow_change_subject	1
max_links	6
read_only	0
ratingenabled	0
url_subject_topic	0
log_moderation	0
attach_start	0
attach_end	14
google_map_api_key
attachment_utf8	1
autoembedsoundcloud	1
emailheader	media/kunena/email/hero-wide.png
user_status	0
plain_email	0
moderator_permdelete	1
avatartypes	gif, jpeg, jpg, png
smartlinking	0
defaultavatar	nophoto.png
defaultavatarsmall	s_nophoto.png
stopforumspam_key
quickreply	0
avataredit	0
activemenuitem
mainmenu_id
home_id
index_id
moderators_id
topiclist_id
misc_id
profile_id
search_id
avatar_type	1
sef_redirect	1
allow_edit_poll	0
use_system_emails	0
autoembedinstagram	1
disable_re	0

| Kunena integration settings:

Warning: Spoiler!

Kunena - Finder Enabled
 Kunena - AltaUserPoints Disabled
 Kunena - Community Builder Enabled:  access=0  login=0  activity=1  avatar=1  profile=1  private=0  
 Kunena - Easyblog Disabled
 Kunena - Easyprofile Disabled
 Kunena - Easysocial Disabled
 Kunena - Gravatar Disabled
 Kunena - JomSocial Disabled
 Kunena - Joomla Enabled:  access=1  login=0  
 Kunena - Kunena Enabled:  avatar=0  profile=1  

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
en-GB	English (United Kingdom)
nl-NL	Dutch (nl-NL)

Third-party components: None

Third-party SEF components: None

Plugins: Search - Kunena Search 5.2.2

Modules: Kunena Search 5.2.2

I've visited your forum and saw, not all attachments are lost.
Go in the backend to Kunena -> Diagnostics and tell us if there are orphaned attachments. But do not click on DELETE BROKEN ITEMS!