XF 2.1 How do get first attachments of resources?

[Thanh Thai]

//My english is not good, i hope you have understand
I want get first attachments of resources. I edit template: xfrm_resource_view
and add this code arg-imageUrl="{{ link('canonical:attachments', $resources.FirstPost.Attachments.first()) }}"




But when view source of resource then url attachments is lost.


Resoures is have attachments file.