Is there a way to upload attachments for multiple test cases mapping with case ID in a single go ?
Thank you for your post. TestRail would allow you to attach files to your test cases via the UI. This would also be on a one by one basis. Currently the TestRail API does not support uploading attachments either but this is something that we hope to include in a future release of TestRail. If you would like, I would be happy to add your vote to this request.