Issue importing attachments when moving Project from another Jira Cloud service

[Gonzalo Benitez de lugo]

I have a Project called 'NEW PRODUCT' at my-domain.atlassian.com. I'm the only user in that Project.

I want to move (duplicate) my project and import it on to a Dev Team's Jira which is at dev-team-name.atlassian.com

I exported all issues from my personal Jira and imported them to the Dev Team's Jira. Everything worked correctly except the attachments.

The Stories have been created. The attachments have been linked to the new Stories but Jira has not been able to import the image because the image is hosted at in my my-domain.atlassian.com and since the project has been imported to dev-team-name.atlassian.com Jira couldn't get the image. 

I also tried another solution. I added the url of the attachments at the original Project to the end of the {{issue.Description}} in the new Project.
If I click on that URL I can see the images but the Dev Team can't because they're not logged in my project.

Worst case scenario:

• I was thinking about downloading all attachments, upload the attachments to a Google Drive folder and add a url like: 
  https://drive.google.com/drive/search?q=image-name.png%20parent:folder-id
  
  This solution would show the image in the Google Drive folder. They would have to double click on the image to see it.

Questions:

1. is there a way to download all attachments from a Project without getting mad?

2. Is it possible to make publicly accessible the files (attachments) in a Jira Project?

Maybe I'm overcomplicating it. How would you move a Project from one domain to another?

[Yevgen Lasman · Accepted solution]

You need to export "Backup for Server" from my-domain.atlassian.com. Then re-pack attachments as described here (as you would import from Server into Cloud) and on dev-team-name.atlassian.com/secure/admin/CloudImport!start.jspa use "Import media" button to import only attachments. Since you will have only attachments for the migrated project you'll get them imported without affecting anything else.

[Gonzalo Benitez de lugo]

Got it! Thanks for the link to the documentation.