When a virtual copy is created, it takes in the webgallery the number, for example 8300_1 but when it is exported from the library it takes the number 8300-2 ( in web gallery number 8300_2 becomes in the export 8300-3 and so on...). Thank you very much to resolve this bug !
I am not quite sure, but I think so. Indeed when I put the gallery on the web, the virtual picture takes the number 8300_1, but then when I export the same picture (for example jpg), it takes the number 8300-2. It is a (big) problem., specially when there are a lot of virtual copies.
Try to create 2 virtual copies. On the web gallery they will be named 8300_1 and 8300_2, but when you export them they become 8300-2 and 8300-3. It just creates confusion. What is the solution ? Thank you very much for your answer.