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The last two options are used to define DataProviders, which were proposed by the Offloading analysis. After uploading/pasting the JSON you can specify the target storage and the group ID for all proposed DataProviders, which are then displayed in an overview. If a DataProvider can't be imported, it will have a red status and you can check the reason in Messages. You can also edit the target storage and the group ID for the specific DataProvider or remove it from the selection. Click 'OK' to confirm the import.
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