When running an analytical app in designer desktop, the user has the ability to choose the location they want the output saved. However, when you move that same app to the gallery, they no longer have that option. They have to download the file and move it to the intended location. Being able to specify the location would save the end user time. I also have an app that uses a formula tool to save the output to the same location as the input, but moving to gallery does not allow the user to do this.