Fix: always pass remove_inbox_tags from UI, dont require in API (#5962)

src-ui/src/app/services/rest/document.service.ts

@@ -183,7 +183,7 @@ export class DocumentService extends AbstractPaperlessService<Document> {
   update(o: Document): Observable<Document> {
     // we want to only set created_date
     o.created = undefined
-    o.remove_inbox_tags = this.settingsService.get(
+    o.remove_inbox_tags = !!this.settingsService.get(
       SETTINGS_KEYS.DOCUMENT_EDITING_REMOVE_INBOX_TAGS
     )
     return super.update(o)

src/documents/serialisers.py

@@ -665,6 +665,8 @@ class DocumentSerializer(
     remove_inbox_tags = serializers.BooleanField(
         default=False,
         write_only=True,
+        allow_null=True,
+        required=False,
     )
 
     def get_original_file_name(self, obj):