We have found a bug in the RM, or at least we think we have.
It's related to the attachments limit.
If you create a resource and try to upload more than the max allowed number of attachments, it's working as expected.
However, if you then edit the resource after its creation, you are able to add again the max allowed number of attachements to the resource.
If you set the limit to 10, at each edit you are able to add 10 new attachments.
Apparently there is no issues with the thread posts.