Hi @Mo Radeka ,
Thank you for your post.
First able I would suggest to keep the attachments in the source and make a link between the tow tools; here you can find how link Jira inside Trello: https://community.atlassian.com/forums/Trello-articles/Update-on-using-Jira-within-Trello/ba-p/3133951
If you need to copy data, you can implement a Middleware lager with tools like Napier.
Hope it helps
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