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Is there any library in kmp can do convert from byteArray into file? Then this file I will upload using ktor client.

You can use <https://square.github.io/okio/|okio> to do this

<@U02PC7RUEJK> but it doesn't show how to convert from byteArray into file

Is this what you are looking for?
```fun okio.Path.writeBytes(content: ByteArray) = okio.FileSystem.SYSTEM.write(this) { write(content) }

fun okio.Path.readBytes(): ByteArray = okio.FileSystem.SYSTEM.read(this) { return readByteArray() }```

okio.FileSystem.SYSTEM.write(this). what is this refer too?

Do you need to save the file? The client will convert the file back into a byte array.

I want convert from byte array into file. let say I got this value only:

```@Serializable
data class ProfilePictureRequestUpdate(val imageArray: ByteArray)```
How to do that?

You don't need to convert to a file first before uploading. You can upload a byte array

<@U052WJUP65S> yeah I do this :

```client.put{
    url (queryUrl + pathProfileUpdate)
    setBody( MultiPartFormDataContent(
            formData {
                append(
                    key = keyUploadProfilePicture,
                    value = profilePicture.imageArray
                )
            }
        )
    )
}.body()```
 but the server return 500

all details about the server in here : <https://youtrack.jetbrains.com/issue/KTOR-7273#focus=Comments-27-10257241.0-0>

<https://github.com/ktorio/ktor-documentation/blob/2.3.12/codeSnippets%2Fsnippets%2Fclient-upload%2Fsrc%2Fmain%2Fkotlin%2Fcom%2Fexample%2FApplication.kt|https://github.com/ktorio/ktor-documentation/blob/2.3.12/codeSnippets%2Fsnippets%2Fclient-upload%2Fsrc%2Fmain%2Fkotlin%2Fcom%2Fexample%2FApplication.kt>

<@UFT11FKSP> the problem is that I didn't know what is image type and fileName. I only have byteArray/ImageBitmap that's all

Multipart form data is for files I think, octet-stream is for bytes (but the server has to allow it)

See how file. ReadBytes just returns the byte array so you don't need to save the file

yeah but the headers required contentType and contentDisposition. so in this case how do i get this information from byteArray?

You should know the type if you're showing it on your app

I use third party library to capture image camera and gallery. that library just provided imageBitmap and byteArray only. By the way I try but server return 505 with message request to long? what does meaning of this? when test upload in postman type is file no have issue.

You can convert the bitmap to png in memory on android there are loads of examples online.

Capture the server request on a tool like Wireshark (or any other that can monitor http traffic). Look at the successful one from Postman and the failing one from Android and examine the differences.

(just read the youtrack ticket and someone recommends doing the same ^^^)

And do you upload (.imageArray) the PNG/jpg data, not the raw ARGB data of the bitmap?

I have upload imageArray but server return 500 request too long. Second time, I got respond "No update data provided" which return 500 error code. <@U72C3TBDH>

<@UFT11FKSP> the problem is that mine just kotlin multiplatform and not only android.