Description:
- Adding new custom emojis on the admin page and changing profile avatar doesn't work as expected.
Steps to reproduce:
- Go to Adminpage -> Custom Emoji.
- Choos a name and a gif file.
- Click on save
Expected behavior:
New emoji is added.
Actual behavior:
Get the err: The formData parameter MUST be an instance of the FormData class.

Server Setup Information:
- Version of Rocket.Chat Server: 3.6.0
- Operating System: GNU/Debian 10 alias Buster
- Deployment Method: tar
- Number of Running Instances: 5
- DB Replicaset Oplog: Yes
- NodeJS Version: 12.16.1
- MongoDB Version: 4.0.20
Client Setup Information
- Desktop App or Browser Version: Both (Browser Firefox/Opera)
- Operating System: Linux and Windows
Relevant logs:
No Log entry on the Server