[MM-48946] Fix read after write issue when uploading data (#21868)

* Fix read after write issue when uploading data

* Prefer request.CTX interface

app/plugin_api.go

@@ -1255,7 +1255,9 @@ func (api *PluginAPI) UploadData(us *model.UploadSession, rd io.Reader) (*model.
 }
 
 func (api *PluginAPI) GetUploadSession(uploadID string) (*model.UploadSession, error) {
-	fi, err := api.app.GetUploadSession(uploadID)
+	// We want to fetch from master DB to avoid a potential read-after-write on the plugin side.
+	api.ctx.SetContext(WithMaster(api.ctx.Context()))
+	fi, err := api.app.GetUploadSession(api.ctx, uploadID)
 	if err != nil {
 		return nil, err
 	}