feat: Edit thumbnail

[R-Delfino95]

Related to #321

• Added support for editing the thumbnail from the “Structure” section as it was before version 2.2.0 of the plugin.
• Added a field to set the thumbnail manually.
• The thumbnail time is saved under thumbTime in the mux.videoAsset document.

Here are some images and a recording of the result:

recording.mp4

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[RitaDias]

Hi!
Just a headsup since the PR has been open for a while that I'll be reviewing it :)

Thank you for setting this up!

[RitaDias]

Hi!
Thank you so much once more for doing this!

The only thing that I would bring up which I found strange (but it's fine, I just wondered if it's expected), is that when I change the thumbnail two things don't happen:

• I am not prompted to publish the changes
• It doesn't change the thumbnail on the actual UI, only on the studio input (see video)

Screen.Recording.2025-02-05.at.13.22.57.mov

I'm assuming this is the intended behaviour but I just want to double check :)

[R-Delfino95]

Hi! Thank you so much once more for doing this!

The only thing that I would bring up which I found strange (but it's fine, I just wondered if it's expected), is that when I change the thumbnail two things don't happen:

• I am not prompted to publish the changes
• It doesn't change the thumbnail on the actual UI, only on the studio input (see video)

Screen.Recording.2025-02-05.at.13.22.57.mov
I'm assuming this is the intended behaviour but I just want to double check :)

Hi! Thanks for reviewing the PR.

The thumbnail functionality is internal to Sanity Studio. As @decepulis mentioned, MUX does not support storing the thumbnail time, so it is simply a value stored in the thumbTime key within the mux.videoAsset document.

If you want to use the thumbnail elsewhere, you would need to get that value from Sanity documents and apply it in your UI.

Let me know your thoughts!