Some files have not passed the integrity check.

[sgofferj]

Some files have not passed the integrity check.

[joshtrichards]

Then this can only be fixed by cms_pico. They're using the cache in HTMLPurifier without setting the path for it so it's defaulting to "wherever the library is installed":

http://htmlpurifier.org/live/configdoc/plain.html

Cache.SerializerPath

[joshtrichards]

Do you happen to have cms_pico installed? It's also possible it's another app that uses the same dependency. Just dealt with this on the forum:

https://help.nextcloud.com/t/some-files-have-not-passed-the-integrity-check-upgrade-to-28-0-4-mail-app/186622/3

The mail app itself doesn't use caching within HTMLPurifier so this isn't technically coming from mail, but it ends up showing as if it is mail's problem.

[sgofferj]

I do have pico_cms enabled, yes.

[joshtrichards]

nextcloud/cms_pico#248 should address this.
You can test the proposed fix by manually patching your cms_pico (it's a single line change) or following the patch install instructions in the Admin Manual: https://docs.nextcloud.com/server/latest/admin_manual/issues/applying_patch.html

You'll also need to delete the extra files shown in a recent integrity report.