Many thanks.
Danilo
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{attachment:all} is not checked inside custom field. I absolutely need to show attachment inside a custom field altough the extension is completely useless!
Another very important thing: when the attachment link is clicked, it must be opened inside browser (or dedicated system app), if mime type permits to do that, like a PDF or MP4 and not saved locally. Best to have the possibility to configure it per attachment or globally or both. The great part of attachments is PDF document and it is very unusefull to save them instead of open in browser/dedicatet system app.