I deleted a custom field which was the incorrect one. How do I revert back?
There is no built-in revert.
If you had issues using this custom field (had values set for this field), then all the values were removed, so the only option to "revert" is to restore a backup of the whole JIRA instance. If this field was not used, you can just re-create it manually with the same configuration (contexts, screes, field configuration, etc..)
Is this possible on the cloud version? How do I go about doing this?
Only backup can help you here. Restore the latest one.
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