Attachments in form

The upload cache controller uses the UploadCache:

zammad/app/controllers/upload_caches_controller.rb at 45c9b70f98e952ec8d9dc93009c3ff4fac5468d3 · zammad/zammad · GitHub

zammad/app/controllers/upload_caches_controller.rb at 45c9b70f98e952ec8d9dc93009c3ff4fac5468d3 · zammad/zammad · GitHub

This is a lib:
zammad/lib/upload_cache.rb at 45c9b70f98e952ec8d9dc93009c3ff4fac5468d3 · zammad/zammad · GitHub

And the foundation of that are the Store & Store::File.

You should find this also in your Postgres, e.g. If you upload a file in the ticket creation mask:

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