"Do not use folders. Put files directly on the root of the SD or USB. Try to play the file using the remote control. Press the blue File button, and then navigate to the file using the green Enter key and the orange Arrow keys. Select the file and press the Enter key. If the file plays, it may not be named properly or the Sprite is not in the correct Control Mode. If using video files, the Sprite must have the Play Mode set to Video or Video Control Mode. If using audio files, set to the Audio or Audio Control Mode. Control Modes require at least 2 files. The looping file must be named 000 and the first trigger file named 001. If the file will not play by using the remote control, then it may be corrupt or made with parameters not supported by the Sprite. Make sure the pixel size is a “television” size, 1920 x 1080, 1280 x 720, 720 x 480 or 640 x 480 etc. Videos made for websites at odd pixel sizes will play on your PC but not on the Sprite. The Sprite will not play 4K video files. Files with pixel sizes of 3840 x 2160 or 4096 x 2160 are 4K. Please convert the files down to 1920 x 1080 sizes using video editing software. " ---Quote from "DV-S1 Sprite Manual revision 4.00 for firmware version 20210416" (Source: medeawiz.com/Downloads.html)