Login it your Inspace Account at https://dashboard.inspacexr.com/

Click into "CMS" and select from your property list

Click on 'Admin'

Click on 'Stack' you will see various options,

Select 'Loading Gallery'.
You can 'select media' or 'upload from computer' then save selection.
​For optimal quality, all images must be 1500px wide and 800 px tall. If you need to resize your images, use this free tool: Resize Here

Once you have made relevant changes make sure to 'save'

Click on 'publish changes' to view the changes made on the live stack.