JUMP TOMasterchannel APIQuickstartAuthenticationGet Api Access TokenpostWebhooksGet WebhooksgetAdd WebhookpostDelete WebhookdeleteFiles & File OperationsFilesUpload FilepostUpload File By UrlpostGet FilegetDelete FiledeleteFile operations: PreviewGet Preview StatusgetInitiate PreviewputGet Preview ResultsgetGet Preview AnalysisgetFile operations: MasterGet Master StatusgetInitiate MasterputGet Master ResultsgetGet Master AnalysisgetFile operations: Spatial UpmixingGet Spatial Upmix StatusgetInitiate Spatial UpmixputGet Spatial Upmix ResultsgetStems & Stem Group OperationsStemsCreate Stem GrouppostGet Stem GroupgetDelete Stem GroupdeleteAdd File To Stem GroupputDelete File In Stem GroupdeleteStem group operations: Spatial UpmixingGet Spatial Upmix StatusgetInitiate Spatial UpmixputGet Spatial Upmix ResultsgetPowered by Add File To Stem Groupput https://api.masterchannel.ai/v1/stem-group/{stem_group_ref}/file/{type}Add file to stem group.