Don't expire attached chat files | Show a warning.

Teams allows users to upload files to share with others in a chat. These files inherit the organization's sharing policy.  

So whether you use Share or Copy Link in SharePoint or OneDrive or you use Attach File in Teams, the same default policy is applied.  

The issue, what makes the Teams experience different from SharePoint / OneDrive, is that the message with the attached file persists in the chat. A file that was attached to a conversation two months ago appears to still be in the chat. However, the default policy blocks access to the file that appears present. Moreover, there is no method for the sender to alter the sharing policy using the Attach function.   

When this an issue, this is a HUGE issue. 

Suggestions: 

• Actually attach the attached file and store in the recipient's Attachments folder.  
• Don't use a paperclip icon that says "Attach file" for files that aren't actually attachments. 
• Warn the sender that the attached file inherits the organization's 'Share with anyone' policy and may expire.  
• Prompt the sender to alter the sharing link before sending. 
• Put a timer on the attachment showing the countdown to expiration.  
• After the expiration date, the file should be labeled "Your organization's sharing policy has expired access to this file". 
• Add a button for the recipient to request access to the file again.