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Bookmarks are not appearing immediately
When adding a bookmark to a streaming video, it's not appearing immediately, I need to play the video for a couple of seconds to get it appears. I am not sure of downloaded videos, but I think they have the same problem.
Do you mean "favorite"?
No, have a look here.
Sorry I was confused. Could you upload a brief gif or screen recording of the behavior by chance?
The delay has to do with generating a thumbnail image we use for the UI. It's likely way more pronounced when using when playing a streaming video compared to a downloaded video (generating a thumbnail will be dependent on internet connection as well). To make the UI snappier, the architecture would need to change somewhat to allow for a deferred delivery of a video thumbnail after the creation of the bookmark.
For reference:

I still don't understand the relation between downloading the thumbnail and creating a bookmark? can't the thumbnail created after the bookmark?
I have uploaded a video here to show you what I exactly mean, it took about 14 seconds for the bookmark icon to appear in the timeline.
Yeah. This is a valid issue. The program flow seems to optimize for the downloaded videos, but it does work as implemented.