Superannotate

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**Added**

- Folder limitations.

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**Fixed**

- Video upload to folder.

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**Added**

- Attach image URLs.

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**Added**

- Folder structure on platform.

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**Updated**

- The FPS change during video upload has more stable frame choosing algorithm now.

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**Updated**

- Improved image storage structure on platform, which requires this upgrade in SDK. This change in platform is backward incompatible with previous versions of SDK.

Changelog not maintained before version 4.0.0.