Why can't I re-upload leads that were in a deleted campaign?
Duplicates are checked across every campaign that still exists. Delete the leads from the old campaign to re-upload.
Acquisity uses workspace-level deduplication to prevent the same person from being emailed by two campaigns at once. A lead is flagged as a duplicate if it's in any other campaign that still exists in your workspace, whatever that campaign's status. Paused, draft, and completed campaigns all still count.
If your leads are being skipped, they still exist in another campaign in this workspace. Open that campaign, go to its Leads tab, select the leads, and click Delete Selected. Then re-upload. Don't delete the campaign itself to free up its leads. Deleting the leads directly is immediate, and you keep the campaign's sending history.
If you already deleted the old campaign and its leads are still flagged, wait a few minutes and try again. The campaign disappears from your list right away, but the cleanup finishes in the background.