EXIF data questions

I understand that EXIF data usually stores thumbnails  and that sometimes this data doesn't always update or get stored correctly.  Is there any way to add or correct this data when its missing?  If I ask PSE to update thumbnail does this get stored within each picture?
Are the EXIF thumbnails that PSE 11 uses actually embedded in photo or as I suspect just uses a link to the catalog?  Since videos can also have EXIF data is it the same for video files?
Thanks in advance

The Old Fart wrote:
I understand that EXIF data usually stores thumbnails  and that sometimes this data doesn't always update or get stored correctly.  Is there any way to add or correct this data when its missing?  If I ask PSE to update thumbnail does this get stored within each picture?
Are the EXIF thumbnails that PSE 11 uses actually embedded in photo or as I suspect just uses a link to the catalog?  Since videos can also have EXIF data is it the same for video files?
Thanks in advance
Thumbnails are created by the organizer (that may take time with big raw files) and are stored ONLY in the catalog as you rightly think.
If you are curious and have a look at a catalog folder (you can find the folder of your active catalog by using the menu Help/system info), you'll see a big file named 'thumb.5.cache'. Technically it's a sqlite database storing your thumbnails. If it is missing (or deleted) it is automatically rebuilt. That's good to know if you want to solve a problem of corruption with thumbnails. You can't have a look at what is inside, unfortunately, only the organizer can use the cache.

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