Transferring additional images, availability text and supplier via API

Good afternoon, please tell me why I can’t transfer additional images, the main one is transferred but the additional ones are not, I use one picture for everything (I also tried different ones). https://prnt.sc/DeWDIqnCCl_9 I also couldn’t find in the documentation how to pass the availability text, in the first version of the API it was availtext (it’s also not in the documentation, I managed to find it) and the supplier, in the first version supplierName, but in the second it was not I managed to find it in the documentation.