How can I re-index a grabbed site?

[wsw70]

When using Karakeep from my Android phone (via "Share ..."), I get inconsistent grabs:

• Instagram ones (this in an example, it is the same with, say, blogs) are OK
• Youtube is sometimes OK, and sometimes not -- in the latter case Youtube requests a login before grabbing

My main question: how can I "re-index" such a failed grab? I could do that from my phone or my laptop, both on which I am logged into Youtube

My subsidiary question: why the inconsistency?

[MohamedBassem]

You can index them by clicking on the "refresh" button in the bookmarks options menu (on the web app).

[wsw70]

Unfortunately this does not work:

Pressing the button in Chrome when logged into Youtube does not refresh the content to the actual video.