try unzipping your backup and uploading the jira data and the attachments as separate zip files?
The JIRA importer will sometimes fail on a zip that has both the jira data and the attachments in a single Zip files.
One zipfile should have the following two files:
Hey Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
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