Description: The total import is 4.6k users and MESSAGES: 109480 in the window before I start the import I am able to deselect all deactivate accounts but that doesn't work...

Error message: https://gyazo.com/8b4316988fc26eda404e01d26c70c3af

Then I see in the import slack window just again SOURCE FILE SELECTION

BUUT its running in the background: https://gyazo.com/b760ce4f7466cbbf1a1ea5bab3e17a95 There is no way to stop it...

It will also only be able to import the users but no messages will be added. Probably because the size is too big? Should add a notice of what is too much for this system to handle.

Server Setup Information:

• Version of Rocket.Chat Server: 0.58.4
• Operating System: Ubuntu 16.04.3 LTS
• Deployment Method(snap/docker/tar/etc): snap
• Number of Running Instances: 1
• DB Replicaset Oplog:
• Node Version: v4.8.4
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Steps to Reproduce:

1. Have a slack server with more then 100k messages or even say 50k along with many users such as 4k+.
2. Select such a file and click on import
3. await failure shutdown and it running after in the background to import users ONLY and the channel names with no messages at all.

Expected behavior:

When I run the import that it works and doesn't go hiding in the background and run regardless. It should show to me when I select a file and click import.

Actual behavior:

the import gives a failure notice in the pop up window in red and then goes back to the standard window and runs in the background

Relevant logs:

https://pastebin.com/PJDnBe4f