@Multipart List<PartData> image uploaded failed, using @Body no issue at all

[hmy65]

Ktorfit version

2.2.0

What happened and how can we reproduce this issue?

client:

 formData {
                append(
                    key = "image_uploaded",
                    value = fileBytes,
                    headers = Headers.build {
                        append(HttpHeaders.ContentType, "image/jpeg")
                        append(HttpHeaders.ContentDisposition, "filename=$fileName")
                    }
                )
            }

server:
move_uploaded_file($_FILES['image_uploaded']['tmp_name'], $save_path)

request log:
CONTENT HEADERS
-> Content-Length: 264
-> Content-Type: multipart/form-data; boundary=-29ba7bac7be92961eeb6d65e5b9fa25b018a-13264733-7a5b7dadb92921f61f886e-
BODY Content-Type: multipart/form-data; boundary=-29ba7bac7be92961eeb6d65e5b9fa25b018a-13264733-7a5b7dadb92921f61f886e-
BODY START
---29ba7bac7be92961eeb6d65e5b9fa25b018a-13264733-7a5b7dadb92921f61f886e-
Content-Disposition: form-data; name=""
Content-Length: 49

io.ktor.http.content.PartData$BinaryItem@1a503a68
---29ba7bac7be92961eeb6d65e5b9fa25b018a-13264733-7a5b7dadb92921f61f886e---

response log:
Undefined array key "image_uploaded"

What did you expect to happen?

fix @multipart

Is there anything else we need to know about?

if i use "@Body map: MultiPartFormDataContent", no issue at all

[hmy65]

@Foso

[hmy65]

same: #739
only @Body works, but @multipart doesn't work