Which importer tool are you using? You can do this using the Importer Tool in the JIRA Administraiton menu. To do this, you would need separate columns for your comments and attachments (and your JIRA server would have to have access to the http/https location that the attachment is located.) Here are the instructions:
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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