Nextcloud smbclient installation failed

i have nextcloud installed one freenas using plugin installation feature. I’m able to add external storage to nextcloud but it’s not showing existing files on the folder , but showing any new files I add to the same folder (I can see all files with the same permissions when I use a windows explorer).

So I hope May be connecting as SMB will solve my problem , but no smbclient available under apps.

Any help will be highly appreciated, other ways I’ll have to move back to my windows server and shares avoiding freenas .