Hi Chris,
I have found the problem. It is located in the CopyFileDocument.java file.
You can fix it by replacing the line 44:
Core.storeImageDocumentContent(this.getContext(), AttachmentObj.getMendixObject(), inputStream, 200, 200);
with:
Core.storeFileDocumentContent(this.getContext(), AttachmentObj.getMendixObject(), inputStream);
I'll try to get a new version of the Email module up tomorrow.