Missing a warning dialog when saving media outside of Signal from the storage menu

• I have searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• I have read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports
• This isn't a feature request or a discussion topic

Bug description

When you safe media from a conversation you get a warning pop-up /dialog/ screen/thingemajing about it not longer being encrypted if you proceed, with the options yes and no. However if you open the storage menu and start saving files from there, there isn't a single warning about the encryption no longer applying. It can not be assumed that a user who saves files this way will know that the encryption no longer applies. If the warning should not be shown every time, than at least one warning should be shown every once in a while if the user safes one or more files.

A security measure such as this encryption can only work if the user is making informed choices. Not warning the user is a significant weakness in this protection.

Device info

Device: Manufacturer Model XVI
Android version: 10.0
Signal version: 5.13.2

Link to debug log

Start by reproducing media saving from the conversation and from the storage menu on Android, comparing the existing encryption warning with the storage-menu flow. Trace the storage-menu save entry point and determine where the warning should appear; done means users receive an informed-choice warning before media saved there loses Signal's encryption protection.