In order to send a file through the chat you have several ways to do it:

Using the attachments button

1. Click on the paperclip icon
2. Search for the desired file and select it.
3. Click on Open.

• Dragging a file

  1. Find the file you want to share in the chat.
  2. Drag a file to the chat area.
  3. Drop the file.

• Paste a file

  1. Find the file you want to share in the chat.
  2. Right click -> copy or Ctrl+C over the desired file.
  3. Right click -> paste or Ctrl+V on the chat text box.

Once you have the file uploaded to the chat simply the rest of the users will be able to download it by clicking on it.