From https://confluence.atlassian.com/automation/jira-smart-values-issues-993924860.html#Jirasmartvaluesissues-attachment I know how to do what I want to all the attachments in issue, e.g.:
{{#attachment}}
!{{filename}}|thumbnail!
{{/}}
But, what it I want to do it only for the attachments selected in a Attachment Picker custom field ?
Jira has no attachment picker field ootb, the only app I know to have custom picker field options is Scriptrunner.
Is this a scriptrunner field?
If so you need to look if this field can be accessed via smart values, probably it can, but you will retrieve a list or text values.
You need to see if you can provide this as a list of attachments in the smart value attachments.
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