[BUG] Broken read-multiple-choice help in DND local file handler [9.7.2 (release_9.7.2-8-gde0df5)]

[Johann Klähn]

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When I drag a file onto a buffer and use `?' at the resulting
`read-multiple-choice' prompt to open the help buffer,
a `(wrong-type-argument char-or-string-p attach)' error occurs.
Ultimately, `org--dnd-local-file-handler' passes a symbol where
`read-multiple-choice' expects a “description” string: the optional
third entry of each “choice”.  Cf. the documentation string of 
`read-multiple-choice':

> CHOICES should be a list of the form (KEY NAME [DESCRIPTION]).
> KEY is a character the user should type to select the entry.
> NAME is a short name for the entry to be displayed while prompting
> (if there’s no room, it might be shortened).
> DESCRIPTION is an optional longer description of the entry; it will
> be displayed in a help buffer if the user requests more help.

I hope that helps.
Thanks for the useful feature and the great 9.7 release. 🙃

Emacs  : GNU Emacs 30.0.50 (build 5, x86_64-pc-linux-gnu, GTK+ Version 3.24.41, 
cairo version 1.18.0)
 of 2024-06-04
Package: Org mode version 9.7.2 (release_9.7.2-8-gde0df5)