Upload file using postman in Asp.net core API

Hi to all,

I use the https://www.c-sharpcorner.com/article/upload-and-display-image-in-asp-net-core-3-1/ to upload a file using postman in core api and also I try this one https://morioh.com/p/d42ad2d7cf8e. But I got the same error. The key '\"""E 4" K"
R""ZX"
""S"F?n""b?"""?"\1" Zo""U""<"""l""".E""BR"L
"eH"""A"W1""c?v{S"L";"""*A"IE;"W1"""V/"""9 CV##X""N?~"    "K""VD?" is invalid jquery syntax because it it missing a closing bracket ('Parameter Key'. Pls share your Idea

thank you in advance.