Notifications for new attachments

Is your feature request related to a problem? Please describe.
As an administrator, I sometimes need to notify users when I add important attachments to a participatory process. Right now, there's no way to let users know when new important files have been added.

Describe the solution you'd like
When adding a new attachment, I want a simple yes/no checkbox asking if I want to notify all users who follow the process about this new file. Similar to a checkbox you have when you update terms and conditions.

Describe alternatives you've considered

• Sending notifications for every new attachment

• Having set rules about which types of attachments trigger notifications

Additional context
This is super important in the context of a participatory process we call "enquêtes publiques" in France. We're trying to make Decidim compatible with the requirements of this process that is codified in the law.

Does this issue could impact on users private data?
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Open Source Politics