Overview:
Vault Loader tab does not appear after logging into Vault.
Root Cause:
Vault Loader is not enabled. Or, the user does not have the required permissions.
Solution:
Check that the Vault Loader is enabled inside the Vault by navigating to: Admin Gear --> Settings --> General Settings --> Vault Loader.

Vault Owners, by default, have Vault Loader permissions. If the Vault Loader is enabled and the User does not see the Vault Loader Tab, check the user permissions to match the following screenshots:
- Navigate to: Admin --> Users & Groups --> Permission Sets --> [Select Permission Set to update] --> Application Tab--> Vault Loader section --> Vault Owner Actions.

- Navigate to: All Tabs --> Loader.

Related Documentation:
Vault Help Documentation: About Vault Loader
Thank you