Option to set "Default note to recipient" messages for external shares.

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Is your feature request related to a problem? Please describe.

I am sending external shares to clients with links daily. I want to show them a message how to download files (download all button) and I am doing this currently by using the "note to recipient" field in the shares editing. I am displaying on all shares the same message. I have to always write the text or copy paste it from a previous share which takes extra time.

Describe the solution you'd like

I would like to have a default "note to recipient" text saved in the administrator or user settings for all new shares which auto-fills the note when a share is created...

Describe alternatives you've considered

Alternatives would be multiple saved "notes" and a dropdown when editing a share.
Or a pop-up information window for all shares.

Additional context

No files or tests are named. Start by tracing external share creation and the existing “note to recipient” field, then determine where administrator or user defaults belong. Done means a configured default automatically fills the note for new external shares.