diff --git a/go_cloud/api b/go_cloud/api
index cf6ef34..ab32f38 100755
Binary files a/go_cloud/api and b/go_cloud/api differ
diff --git a/go_cloud/internal/http/wopi_handlers.go b/go_cloud/internal/http/wopi_handlers.go
index c07cc72..a808ed5 100644
--- a/go_cloud/internal/http/wopi_handlers.go
+++ b/go_cloud/internal/http/wopi_handlers.go
@@ -878,8 +878,11 @@ func collaboraProxyHandler(w http.ResponseWriter, r *http.Request, db *database.
 	// Get the correct Collabora editor URL from discovery (includes version hash)
 	editorURL := getCollaboraEditorURL(collaboraURL)
 
-	// WOPISrc is passed unencoded in the query parameter
-	collaboraFullURL := fmt.Sprintf("%s?WOPISrc=%s", editorURL, wopiSrc)
+	// URL-encode the WOPISrc for use in the query parameter (Collabora expects this)
+	encodedWopiSrc := url.QueryEscape(wopiSrc)
+
+	// Build the full Collabora URL with WOPISrc as query parameter
+	collaboraFullURL := fmt.Sprintf("%s?WOPISrc=%s", editorURL, encodedWopiSrc)
 
 	// Return HTML page with auto-submitting form
 	// No access_token needed in body since it's in WOPISrc