I am just getting started with SharePoint Add-Ins in 2013. My background is in on-Premise development, or server-side development. I have one Office 365 site, and several SharePoint Hosted sites with Apps4Rent. I have built a couple of demo Apps (or Add-Ins, as they are now called) using Napa, and I want to deploy them to my hosted sites. The only option I see is to deploy it to the SharePoint App Store. Is there any way to just download the apps, and upload it to my Solutions gallery? What is the best way to go about this?
UPDATE: Progress! I figured out that I had to Publish my App from Napa, now I can download it as an .app file to my hard drive. Now I need to convert it to a .wsp so my other site will recognize it. So, how do I convert an .app file to a .wsp file?
UPDATE AGAIN: I am really grasping at straws here. I do not KNOW the best way to proceed, that is why I am asking for help. What I have determined so far is that I can use an App Catalog if I was copying from one Office 365 site to another. But the destination site is not an Office 365 site. I cannot create an App Catalog there. So I see no way to deploy an .app file. That is why I think I need a .wsp file to deploy it to the Solutions gallery. But I am very much open to any OTHER suggestion as to how to proceed.