You can view Galleries in two modes: slideshow or manual.
The slideshow mode allows viewing a gallery as a video where images change from one to another automatically in the pace set by the OMS author. With each new frame an audio starts playing and a text pops up (if the frame contains such accompanying information).
By default, the galleries are set for manual viewing.
If you use the manual viewing mode (that is set by default), you can scroll through frames, forward or back, as follows:
When you open a new frame, an audio starts playing and a text pops up (if the frame contains such accompanying information).
In the manual mode there is also an option of accessing directly any frame you want. Click on the button icons (4) on the control panel of the gallery. You will see a series of thumbnails. Click on selected thumbnail to view the frame you want.
In case if an author was using one audio file for the entire gallery, it can be viewed only in the slideshow mode.