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Click on your profile picture in the top right corner.
Select Organization Settings, and click on Collections.
Click on Create Collection and give the collection a name.
Once the collection is created, you need to share it with someone, otherwise it will not be visible to anyone. To share a collection, follow these steps:
Click on the menu selector on the right side of the collection (three dots).
Choose Sharing Settings.
In the window that opens, you can specify who you want to share the collection with. There are essentially three types of recipients you can choose from:
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