Enum listing the possible types of a video thumbnail.
| Enums | |
|---|---|
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                The type has not been specified. | 
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                The received value is not known in this version. This is a response-only value. | 
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                The default thumbnail. Can be auto-generated or user-uploaded. | 
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                Thumbnail 1, generated from the video. | 
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                Thumbnail 2, generated from the video. | 
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                Thumbnail 3, generated from the video. |