When you're in a chat, you can send messages that include files, pictures, and links.
Send a link
To send a link, select Format 
beneath the message box, then select Insert link 
.
Add display text and the address, select Insert, or copy and paste the link into the message box, and then select Send 
.
Once you send it, the message containing your link includes a thumbnail image and preview, which you can close if you want to.
Note: Teams has its own ATP Safe Links security to verify that any link that you send or receive is safe to choose. As an added layer of protection, we'll let you know about a potentially unsafe link.
Include a file or picture
To include a file or picture in a message, select Choose file 
beneath the message box. Then upload a file or picture from your computer or OneDrive.
In a chat conversation, select Choose file and choose a file or picture from your computer or OneDrive.
Send a link
Enter or paste a link into your message box.
Attach a picture
To attach a picture to a message, tap Add photo 
beneath your compose box to take a photo or to open your photo library.
Attach a file
To attach a file to a message, tap Choose file beneath the message box and then go to the file location.
From a chat or meeting, tap the attachment to open it with a Microsoft 365 app. In a channel conversation, tap the attachment or go to Tabs > Files.
