Here the full project is fine in the Microsoft OneDrive viewer. It may be necessary to double-click the speaker icon to hear the audio.
Two more apparent errors were noted and corrected: the slides of the seated woman and the drink, near the head, were each about 23-seconds long. They have been changed to five-seconds.
Here's a 1080 version. See how it does after downloading. Windows Media Players handle it well.
If it's good now, this hints that your PC is balking at 4K, which may have been the issue from the outset.
If it's still incomplete, try accessing and playing the file on another PC, if available.
As to 4K, here's an AI summary...
"The benefit of 4K in most home viewing environments is debatable and often considered "oversold" because the difference between 4K and 1080p is unnoticeable at typical viewing distances and screen sizes.
For the average person with a standard-sized TV and a common viewing distance, their eyes may not be able to resolve the extra pixels, making the upgrade to 4K not worthwhile based on resolution alone. However, 4K does provide benefits such as sharper detail, better color, and smoother images, particularly on larger screens or when viewed up close."
