The app periodically (every 10 min., can be changed) checks updates. If the file list in the folder has changed, the app starts downloading new files. When all the files get ready, signage contents are replaced. Files that are no longer needed are removed from the device.
If you want to update signage contents immediately after replacing files in the folder, you can do so by double tapping the screen.
Images and videos in the Google Drive folder are displayed in the order of the file name. If you want to change the order, you can add numbers to the beginning of the file names (e.g., 01image.jpg, 02image.jpg) or otherwise manipulate the file name.
Default settings are: display time (for images only), fade-in duration, fade-out duration, rotation, and scale (fit into screen / cropped to fill screen). The default settings are applied to all images and videos.
Supported image and video formats follow the formats supported by Android (depending on the Android version and device).