Sepehr Nazari, this is how our Rich Media feature works.  The vast majority of  users don't need to upload more then one photo at a time for blog posts. Much more important is to positioned the photo within text. To do this you need to operate only of one photo.
As far as I know, there is no  such kind of plugin in Store because it is required very complicated custom code modification. But you may find a developer who can help you. You can do it here: http://www.oxwall.org/market/specialists .

Thanks Taissa

I meant in the newsfeed where it says "what's happening" 

Like the below picture, but I think it would be same and maybe complicated.
If there was a way to share a photo album still could help when this is needed.

Sepehr, this is also considered as a custom code modification, you will need to do that on your own or hire a programmer. 

Also you can make a suggestion on uservoice: http://oxwall.uservoice.com/forums/13756-ideas-for-oxwall if it gets enough voices, we'll consider implementing it

In the meantime you will need to do that on your own or hire a programmer. Besides you can make a post in the Custom code modification section of the forum, probably some community member will assist you with that as we do not provide assistance on custom code modifications.