Yes, you could also use milestones and tag the task with that milestone. For example, this is done at Wikimedia's Phabricator: https://phabricator.wikimedia.org/project/subprojects/5539/, where milestones are used to track changes associated with a task.

In addition to the above, it seems that commit d017f3f21021 is what broke this. And adjustTransactionValues is what changes the xaction from

Array
(
    [+] => Array
        (
            [0] => PHID-PIMG-m5pqg3eec46uvzw6uynm
        )

In D25052#1750, @avivey wrote:

I'd expect some PHP code to actually attach the files from attachedFilePHIDs to the relevant object, but I don't see it in this diff. Is that already happening somehow?

It's done here: https://we.phorge.it/source/phorge/browse/master/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php;5aa159a83013fca3a72f5c6d2c493c117fbbf83b$2296

Auto file attachments are also not working when editing a comment.

Differentiate between metadata of different text areas using node ID. e.g., new comment text areas and text areas in the edit comment dialog.

ran celerity map again

arc liberate

Linting

https://phabricator.wikimedia.org/D1203 is my fix for this issue at Wikimedia's install.