Attaching a file in a message on the LinkedIn app:
You would be able to attach up to 5 files in a single message. Read on to know how:
Open the LinkedIn app on your mobile device.
Then tap on the Messaging icon which is found at the top of the homepage.
Find the New Message icon on the left rail and tap on it.
Now, draft the message that you want to send and click on the Attach icon.
Then insert links for you to download files into the conversation.