
According to this Microsoft article, you can only restore a site collection in SharePoint Server by using PowerShell.
Please run following PowerShell to restore a site collection in SharePoint Server.
Restore-SPSite -Identity <SiteCollectionURL> -Path <Backup file> [-DatabaseServer <DatabaseServerName>] [-DatabaseName <ContentDatabaseName>] [-HostHeader <Host header>] [-Force] [-GradualDelete] [-Verbose]
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