An admin changed the permission scheme and excluded you, or changed your group or role memberships so that you no longer match the rules in the scheme.
(Or, on an outside possibility, the server ran out of space, and JIRA disabled the attachments functionality)
In all cases though, you need to talk to your administrators.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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