@Final Don't know if this is a known bug or not. When I export contacts from the stock GOS Contacts app, I can't import them into Nextcloud. Apparently it outputs an older version of the .vcf format and it has to be newer for Nextcloud to use it. When I use the Fossify Contacts app, it exports and imports into Nextcloud with no issue. I haven't used a .vcf file in so long I didn't even know they had changed anything.