What platform are you using for explore stars app. Here is a how to install it for windows. I had this same issue and it was the fact I wasn’t putting the correct file in my photos folder.
Just starting in this Hobby, I have been doing wildlife and landscape photography.
Exos2-gt PMC-8, Celestron Alt/Azimuth
Celestron SLT 130, William Optics Star 71 app, Olympus 7-14,12-40,40-150 Pro
Olymous om-d E-M5 Mkii, SBIG STF8300M