marked some missed file APIs (#26279)

* marked some missed file APIs

* Added file handler flag to shared c hannel attachment API

server/channels/api4/license.go

@@ -21,7 +21,7 @@ import (
 func (api *API) InitLicense() {
 	api.BaseRoutes.APIRoot.Handle("/trial-license", api.APISessionRequired(requestTrialLicense)).Methods("POST")
 	api.BaseRoutes.APIRoot.Handle("/trial-license/prev", api.APISessionRequired(getPrevTrialLicense)).Methods("GET")
-	api.BaseRoutes.APIRoot.Handle("/license", api.APISessionRequired(addLicense)).Methods("POST")
+	api.BaseRoutes.APIRoot.Handle("/license", api.APISessionRequired(addLicense, handlerParamFileAPI)).Methods("POST")
 	api.BaseRoutes.APIRoot.Handle("/license", api.APISessionRequired(removeLicense)).Methods("DELETE")
 	api.BaseRoutes.APIRoot.Handle("/license/renewal", api.APISessionRequired(requestRenewalLink)).Methods("GET")
 	api.BaseRoutes.APIRoot.Handle("/license/client", api.APIHandler(getClientLicense)).Methods("GET")