Can't send Apple keynote files through the Upload File feature (still present on 3.6.1) UPDATE: still present on 3.7.1

Description:

When trying to upload a apple keynote file (.key), even though in the allowed file section this format is allowed (application/vnd.apple.keynote) The file can't be uploaded

Steps to reproduce:

1. add the filetype application/vnd.apple.keynote to the allowed media types for upload if not already present
2. upload an apple keynote file with extension .key on rocketchat

Expected behavior:

the file is uploaded correctly

Actual behavior:

Error message popup: Media type not allowed *.key

Server Setup Information:

• Version of Rocket.Chat Server: 3.6.1
• Operating System: Centos 7.8
• Deployment Method: docker
• Number of Running Instances: 1
• MongoDB Version: 4.0

Client Setup Information

• Desktop App or Browser Version: Desktop app version 3.0.2
• Operating System: Windows 10

Additional context

This problem has been present since 2.4.0 and not yet resolved. See the referenced issue #16594

Reproduce the upload using an Apple Keynote .key file with application/vnd.apple.keynote allowed, then trace the media-type validation path that produces “Media type not allowed *.key.” Done means a permitted .key file uploads successfully without that error.