Import work only one time

the import only works once. is this a bug or a feature? How can I make it so that I can import more than once?

Thank you for your report.
The problem was confirmed. We’ll try to fix it in one of the future updates.
I’ll inform you about any progress on this issue.

We fixed your reported problem in the latest dhx.Diagram update (v6.0).
Now the import should work correctly.
Please, download the latest available dhx.Diagram build from your client’s are to get this fix.
Thank you for your report.