diff --git a/internal/http/services/appprovider/appprovider.go b/internal/http/services/appprovider/appprovider.go
index c06b808fc06..0bcba7b453c 100644
--- a/internal/http/services/appprovider/appprovider.go
+++ b/internal/http/services/appprovider/appprovider.go
@@ -49,6 +49,10 @@ import (
 	"github.com/rs/zerolog/log"
 )
 
+const (
+	idDelimiter string = ":"
+)
+
 func init() {
 	global.Register("appprovider", New)
 }
@@ -199,14 +203,17 @@ func (s *svc) handleNew(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// Stat created file and return its file id
+	// Stat the newly created file
 	statRes, ocmderr, err := statRef(ctx, provider.Reference{Path: target}, client)
 	if err != nil {
 		log.Error().Err(err).Msg("error statting created file")
 		ocmd.WriteError(w, r, ocmderr, "Created file not found", errtypes.NotFound("Created file not found"))
 		return
 	}
-	js, err := json.Marshal(map[string]interface{}{"file_id": statRes.Id})
+
+	// Base64-encode the fileid for the web to consume it
+	b64id := base64.StdEncoding.EncodeToString([]byte(statRes.Id.StorageId + idDelimiter + statRes.Id.OpaqueId))
+	js, err := json.Marshal(map[string]interface{}{"file_id": b64id})
 	if err != nil {
 		ocmd.WriteError(w, r, ocmd.APIErrorServerError, "error marshalling JSON response", err)
 		return