We are trying to merge two instances of linked Jira and Confluence into one. Right now I am testing import of projects from ver 7.12.2 Jira software into ver 7.6.4 Jira software.
I used the Project Configurator plugin to export and tried to import the project with Jira's native project import tool. I got the error "The file [file directory] is not a valid JIRA backup."
I'm not sure if this is a problem due to version differences, or if it might be something else. I found the following when searching for a solution:
https://community.atlassian.com/t5/Jira-Software-questions/Error-after-modifying-the-xml-backup-file/qaq-p/691638
I guess for now, I want to know if there's any safe way to import a project from a newer version of Jira to an older version. It would be preferable if we didn't have to upgrade.