Importing attachments from JIRA Cloud to JIRA Server

Question

We are on-boarding a sister company and I need to migrate their projects (over 20K of issues) from JIRA Cloud (v7.2) into our JIRA self-hosted JIRA Server (v6.3)

They really want to migrate all attachments

Help needed:

* Is there a way to import attachments?
* Is CSV the only and the best way for this import?

Thanks in advance!

Michael

Tarun Sapra · Answer

I am planning to write a python script, wherein the newly imported issues carry their original issueKey in an custom field and the script would copy the attachment based on the original issues key from the source instance and attach the attachment file to the new issue in the target instance.

Michael Voronkov · Answer

We ended up writing a C# program to attach files through JIRA APIs

Tarun Sapra · Answer

I am facing a similar situation, Did you manage to find a way out of it?