If you are downloading multiple videos at the same time, the clock icon will be displayed and some videos may not start downloading.
This clock mark shows when you add multiple videos to the download tasks which reaches the maximum number of simultaneous downloads. This indicates waiting in the queue.
In this case, please wait for the download of other videos to complete.
If the maximum number of simultaneous downloads is 4, a clock mark will be added after 5 downloads. When the download of the video in progress is completed, the waiting videos will be downloaded in order.
To change the maximum simultaneous downloads, you can refer to the Download manual.