i am using nextcloud 12.0.4 running on centos 7
after i upgraded the NC some apps upgrade automatically so
what i found out is about mail apps add attachment from files
It’s a known issue with this release. Currently there is no easy fix from my reading
OK thank you for your information, i will downgrade the version of Mail but i will encountered error of invalid signature but its ok as long as will not affect the performance of nextcloud.
thank you very much