Thumbnail not update when folder content change

[BK201]

Once the thumbnail of folder is generated, it will stay with that thumbnail forever, no matter how many times the content of it changes
If you want to update it, the only way I found is go to option > thumbnail database > cached directories then scroll for 10 days (it don't have a search or filter feature btw), then delete the folder you want to update

This is really a tedious solution with my general pic collection
demo: https://imgur.com/o9onolB

Please:
1. Make it possible to auto update folder thumbnail (with an option maybe)
2. Add a "rebuild thumbnail" option for contextmenu of folders

[xnview]

1. Make it possible to auto update folder thumbnail (with an option maybe)

Currently i have no way to know that folder content has changed, only check all files

2. Add a "rebuild thumbnail" option for contextmenu of folders

You have View>Rebuild thumbnail

[BK201]

2. Add a "rebuild thumbnail" option for contextmenu of folders

You have View>Rebuild thumbnail

Thanks I found one in the database page but I think it's rebuild all thumbnails which is way too much
I didn't found that there's an option in view mode too