Help closing paths so dxf file will work in sendcutsend

I am having two metal plates cut using sendcutsend, but I'm not very experienced with preparing dxf and similar files to be cut using cad software. When I upload the files, the preview looks distorted, and I think there are probably unclosed paths. I'm looking for someone to help me make sure the file can be used in sendcutsend. If you can help, please include the word "briefcase" in your bid so I know you've read the description and can complete the project for the amount bid.