Thanks so much for your help!
I'm working on this now.
1. I just removed that custom field.
2. I can't figure out how to see details of the link types that are present in the Apache JIRA. Looking at the list link types in our OnDemand instance, I see that a link type consists of a Name, Outward Description, and Inward Description.
We have 28 "Related" links in our JIRA and I just need to know what to change that instance type to so that it match an existing instance type in the Apache JIRA.
Here is what the "Related" link type has for the following values:
Outward Description: relates to
Inward Description: relates to
Can you look at what the equivalent link type in our Apache JIRA has for these settings? Settings are under [gear icon] > System. Select Issue Features > Issue Linking. I *think* that the outward description is "relates to" and the inward is "is related to", can you please confirm that and also the Name of the link type?
3. I tried googling to see how I might verify the attachments. I found https://answers.atlassian.com/questions/143808/project-import-attachments-do-not-exist-in-the-attachment-directory
which says "When trying to import the project to a different instance, have you copy the Attachments for the instance into the $Target_JIRA_HOME/import/attachments folder before proceed with the import". If necessary, we might consider just doing the export without attachments to get this done.