Add your favorite music track to your slideshow video. 4. Adjust how long you want your slideshow to be anywhere from 5 to 60 seconds. 5. Add some magic to your slideshow by selecting beautiful transitions. 6. Share Slideshow on Instagram, Vine, Snapchat, Facebook, Youtube, Whatsapp, E-Mail or save it to your Camera Roll. Important notes: - If you cant add Photos or Photos the reason most likely you have not given access to it. Please go to Settings --> Privacy --> Photos or Photos --> Find Slidemaker and make sure it's enabled. - If you are making a slideshow for Snapchat please note to adjust timer between 5 to 10 seconds. For Instagram and Facebook it can be anywhere between 5 to 60 seconds.