Frontend upload and frontend Ajax ver 8.8.x

If you encounter problems after installing/upgrading to version 8.8 read this topic:

The latest development is a modern way of doing ajax calls using REST API. This method is believed to be stable and reliable. Unfortunately also this method does not work on all sites, so the old existing methods are still available.

When you install version 8.8.x the REST API method will be set automatically.
If frontend upload no longer works, or pages are reloaded when you click a link where previously only the content of a dsplay would be altered, the REST API does not work.

There are security plugins where you have to specify namespaces for REST API to work, the namespace for this plugin is wp-photo-album-plus

If it does not work for any reason you can select a different frontend ajax method in:
Photo ALbums -> Settings -> Advanced settings -> System -> I -> Item 5: Frontend Ajax method

Use Backend method if you do not have a security plugin that denies access to admin-ajax.php from the frontend, or By redirection, the previous default method that also did not work on all sites.

The last resort is: None, what is not good for the user experience and therefor not recommended. Frontend uploads will still use Backend method in this case, so maybe you can not use it at all then.