Hi,

I'm not sure I understand your question.

You stated:

"The problem is that it allows me to select multiple pictures and then upload the same moment."

Did you mean?:

The problem is that it does not allow me to select multiple pictures and then upload at the same time."

If so, this is due to the medium trust configuration. The multiple upload functionality is provided by NeatUpload which doesn't work in Medium Trust.

HTH,
Joe D.

You cannot overcome it in medium trust hosting, it only works in full trust. If multi file upload is important to you then you should find full trust hosting.