According to the device's resolution, the playback of DOCUMENT content types (pdf) may be blocked on mobile devices, unless the user taps on the icon which is visible over the player and goes fullscreen. To avoid this, always make sure to include the following in the embed parameters:

minHeightWidthPercent: 0

Here's an example:

<div id="xyz" style="width: 100%; height: 100%"></div>

var options = {
  clientId: '<your clientId>',
  xcontentId: '<xcontentId here>',
  sessId: '<a valid pkey here>',
  autoplay: true,
  minHeightWidthPercent: 0,  
  mouseWheelZoom: false,
};

var player = THRONContentExperience("xyz", options);