Client preview - it's easy:

Click on the link of the selected Spherical Photo (visible in File Lister).
Spherical photography will open in a new tab.
Copy the address from the browser.
Replace in the code below (paste) - https: // NEW_CARD_ADRESS_PASTE

Place on the site wherever you want - HTML your photo sphere:

<div style='width:100%;height:0;padding-bottom:56.25%;overflow:hidden;position:relative;'><iframe allowfullscreen='' frameborder='0' mozallowfullscreen='' src='https://NEW_CARD_ADRESS_PASTE' style='height:100%;position:absolute;top:0;width:100%;left:0; overflow:hidden;' webkitallowfullscreen=''></iframe></div>

or You can use your iframe code.

Preview Photosphere