NSExtensionFileProviderUploadPipelineDepth
The per-domain limit of concurrent calls that a file provider extension can make to upload data.
Discussion
Use this value to set the limit of concurrent calls to methods like createItem(basedOn:fields:contents:options:request:completionHandler:) and modifyItem(_:baseVersion:changedFields:contents:options:request:completionHandler:). Set the value for this key to an integer in the range 1 to 128.