By default, any member (but not guests) can create custom emoji. If they'd like to, owners and admins can limit this permission to only owners and admins.
Change customised emoji permissions
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From your desktop, click on your workspace name in the top left.
Select Settings & administration from the menu, then click on Workspace settings.
Click on the Permissions tab.
Next to CustomEmoji, click Expand.
Below People who can manage customised emoji, choose an option from the drop-down menu.
Click Save.
Org level
Org owners and admins can set an org policy to determine customised emoji permissions for all workspaces in their org.
From your desktop, click on your workspace name in the top left.
Select Settings & administration from the menu, then click on Organisation settings.
Click on Settings in the left sidebar, then select Organisation policies.
Click the Permissions tab.
Next to Customised emoji, click onAdd policy.
Tick the box next to Only workspace owners and admins may add customised emoji.
Click on Save policy, then Create policy to confirm.
Workspace level
If an org policy hasn't been set, workspace owners and admins can manage customised emoji permissions for their workspace(s).
From your desktop, click on your workspace name in the top left.
Select Settings & administration from the menu, then click on Workspace settings.
Click the Permissions tab.
Next to Customised emoji, click on Expand.
Below People who can manage customised emoji, choose an option from the drop-down menu.