Unable to Export attachments of a project from jira 5.1.2 to jira 7.3.3 instance

[Ashwini Amrutheshwar]

I am unable to export attachments of a project from Jira 5.1.2 to Jira 7.3.3 instance.

Tried download attachments for Jira plugin in 5.1.2, with which I could get the attachments zip file. But the same could not be imported in Jira 7.3.3 instance.

Tried one more plugin JAM Attachments manager for Jira in 7.3.3. To test, I did an export of the attachments and tried to import the same. The import is failing with this plugin. When I try to browse the zip file, it is not detecting the file at all.

Please help me out in figuring out a solution for this as to how we can get the attachments from 5.1.2 to 7.3.3 Jira instance. Let me know if there are any plugins available on both versions, which can export and import attachments.