diff --git a/changelog/unreleased/restart-postprocessing.md b/changelog/unreleased/restart-postprocessing.md
new file mode 100644
index 00000000000..73850899879
--- /dev/null
+++ b/changelog/unreleased/restart-postprocessing.md
@@ -0,0 +1,6 @@
+Bugfix: Restart Postprocessing
+
+In case the postprocessing service cannot find the specified upload when restarting postprocessing, it will now send a
+`RestartPostprocessing` event to retrigger complete postprocessing
+
+https://github.com/owncloud/ocis/pull/6726
diff --git a/services/postprocessing/pkg/service/service.go b/services/postprocessing/pkg/service/service.go
index 3e2afc077b0..ab2101dcb51 100644
--- a/services/postprocessing/pkg/service/service.go
+++ b/services/postprocessing/pkg/service/service.go
@@ -87,6 +87,15 @@ func (pps *PostprocessingService) Run() error {
 		case events.ResumePostprocessing:
 			pp, err = getPP(pps.store, ev.UploadID)
 			if err != nil {
+				if err == store.ErrNotFound {
+					if err := events.Publish(pps.pub, events.RestartPostprocessing{
+						UploadID:  ev.UploadID,
+						Timestamp: ev.Timestamp,
+					}); err != nil {
+						pps.log.Error().Str("uploadID", ev.UploadID).Err(err).Msg("cannot publish RestartPostprocessing event")
+					}
+					continue
+				}
 				pps.log.Error().Str("uploadID", ev.UploadID).Err(err).Msg("cannot get upload")
 				continue
 			}