I create new records from the frontend and in the first step i would like to upload the images.
I would like to create the record and his relationship only at the end of the process to avoid unnecessary data in the database.
The upload works, and I get the ID of the file.
But how do I save it in my multiFform-Session? Do I use a separate handleswfupload function?
Shouldn't have to update the handleswfupload().. you have the ID, so there must be a way to store the value in your MultiForm module.. I've never used that module, but I assume it works on sessions. You could do it crudely by using Session::set(), I suppose.