media-files POST for creation is not working

[AkeneoUser]

The form data looks ok to me and seems to comply with the specs of the media-files api, but I'm getting an error response.

invokehttp.response.body
{"code":422,"message":"You should at least give one of the following properties: "product" or "product_model"."}

0x00000000 | 2D | 2D | 38 | 44 | 7A | 67 | 61 | 58 | 66 | 58 | 53 | 4C | 39 | 63 | 77 | 41 | --8DzgaXfXSL9cwA
0x00000010 | 41 | 41 | 65 | 4D | 74 | 66 | 69 | 43 | 59 | 45 | 66 | 43 | 35 | 4A | 59 | 56 | AAeMtfiCYEfC5JYV
0x00000020 | 68 | 64 | 6A | 6C | 57 | 66 | 4E | 76 | 64 | 67 | 0D | 0A | 43 | 6F | 6E | 74 | hdjlWfNvdg..Cont
0x00000030 | 65 | 6E | 74 | 2D | 44 | 69 | 73 | 70 | 6F | 73 | 69 | 74 | 69 | 6F | 6E | 3A | ent-Disposition:
0x00000040 | 20 | 66 | 6F | 72 | 6D | 2D | 64 | 61 | 74 | 61 | 3B | 20 | 6E | 61 | 6D | 65 | form-data; name
0x00000050 | 3D | 22 | 70 | 72 | 6F | 64 | 75 | 63 | 74 | 22 | 0D | 0A | 0D | 0A | 7B | 22 | ="product"....{"
0x00000060 | 69 | 64 | 65 | 6E | 74 | 69 | 66 | 69 | 65 | 72 | 22 | 3A | 22 | 53 | 47 | 36 | identifier":"SG6
0x00000070 | 39 | 30 | 32 | 32 | 53 | 50 | 22 | 2C | 20 | 22 | 61 | 74 | 74 | 72 | 69 | 62 | 9022SP", "attrib
0x00000080 | 75 | 74 | 65 | 22 | 3A | 22 | 69 | 6D | 61 | 67 | 65 | 5F | 61 | 22 | 2C | 20 | ute":"image_a",
0x00000090 | 22 | 73 | 63 | 6F | 70 | 65 | 22 | 3A | 6E | 75 | 6C | 6C | 2C | 22 | 6C | 6F | "scope":null,"lo
0x000000A0 | 63 | 61 | 6C | 65 | 22 | 3A | 6E | 75 | 6C | 6C | 7D | 0D | 0A | 2D | 2D | 38 | cale":null}..--8
0x000000B0 | 44 | 7A | 67 | 61 | 58 | 66 | 58 | 53 | 4C | 39 | 63 | 77 | 41 | 41 | 41 | 65 | DzgaXfXSL9cwAAAe
0x000000C0 | 4D | 74 | 66 | 69 | 43 | 59 | 45 | 66 | 43 | 35 | 4A | 59 | 56 | 68 | 64 | 6A | MtfiCYEfC5JYVhdj
0x000000D0 | 6C | 57 | 66 | 4E | 76 | 64 | 67 | 0D | 0A | 43 | 6F | 6E | 74 | 65 | 6E | 74 | lWfNvdg..Content
0x000000E0 | 2D | 44 | 69 | 73 | 70 | 6F | 73 | 69 | 74 | 69 | 6F | 6E | 3A | 20 | 66 | 6F | -Disposition: fo
0x000000F0 | 72 | 6D | 2D | 64 | 61 | 74 | 61 | 3B | 20 | 6E | 61 | 6D | 65 | 3D | 22 | 66 | rm-data; name="f
0x00000100 | 69 | 6C | 65 | 22 | 3B | 20 | 66 | 69 | 6C | 65 | 6E | 61 | 6D | 65 | 3D | 22 | ile"; filename="
0x00000110 | 73 | 67 | 70 | 2D | 67 | 66 | 2D | 76 | 2D | 6E | 70 | 2E | 6A | 70 | 67 | 22 | sgp-gf-v-np.jpg"
0x00000120 | 0D | 0A | 43 | 6F | 6E | 74 | 65 | 6E | 74 | 2D | 54 | 79 | 70 | 65 | 3A | 20 | ..Content-Type:
0x00000130 | 61 | 70 | 70 | 6C | 69 | 63 | 61 | 74 | 69 | 6F | 6E | 2F | 6F | 63 | 74 | 65 | application/octe
0x00000140 | 74 | 2D | 73 | 74 | 72 | 65 | 61 | 6D | 0D | 0A | 0D | 0A | EF | BF | BD | EF | t-stream........
0x00000150 | BF | BD | EF | BF | BD | EF | BF | BD | 00 | 18 | 45 | 78 | 69 | 66 | 00 | 00 | ..........Exif..
0x00000160 | 49 | 49 | 2A | 00 | 08 | 00 | 00 | 00 | 00 | 00 | 00 | 00 | 00 | 00 | 00 | 00 | II*.............
0x00000170 | EF | BF | BD | EF | BF | BD | 00 | 11 | 44 | 75 | 63 | 6B | 79 | 00 | 01 | 00 | ........Ducky...
0x00000180 | 04 | 00 | 00 | 00 | 3C | 00 | 00 | EF | BF | BD | EF | BF | BD | 04 | 0C | 68 | ....<..........h
0x00000190 | 74 | 74 | 70 | 3A | 2F | 2F | 6E | 73 | 2E | 61 | 64 | 6F | 62 | 65 | 2E | 63 | ttp://ns.adobe.c
0x000001A0 | 6F | 6D | 2F | 78 | 61 | 70 | 2F | 31 | 2E | 30 | 2F | 00 | 3C | 3F | 78 | 70 | om/xap/1.0/. 0x00000250 | 3C | 72 | 64 | 66 | 3A | 52 | 44 | 46 | 20 | 78 | 6D | 6C | 6E | 73 | 3A | 72 | 0x00000510 | 3C | 72 | 64 | 66 | 3A | 41 | 6C | 74 | 3E | 20 | 3C | 72 | 64 | 66 | 3A | 6C | Web < 0x00000550 | 2F | 64 | 63 | 3A | 74 | 69 | 74 | 6C | 65 | 3E | 20 | 3C | 2F | 72 | 64 | 66 | /dc:title> .......
0x000005A0 | 48 | 50 | 68 | 6F | 74 | 6F | 73 | 68 | 6F | 70 | 20 | 33 | 2E | 30 | 00 | 38 | HPhotoshop 3.0.8
0x000005B0 | 42 | 49 | 4D | 04 | 04 | 00 | 00 | 00 | 00 | 00 | 0F | 1C | 01 | 5A | 00 | 03 | BIM..........Z..
0x000005C0 | 1B | 25 | 47 | 1C | 02 | 00 | 00 | 02 | 00 | 02 | 00 | 38 | 42 | 49 | 4D | 04 | .%G........8BIM.
0x000005D0 | 25 | 00 | 00 | 00 | 00 | 00 | 10 | EF | BF | BD | EF | BF | BD | 1F | EF | BF | %...............
0x000005E0 | BD | C8 | B7 | EF | BF | BD | 78 | 2F | 34 | 62 | 34 | 07 | 58 | 77 | EF | BF | ......x/4b4.Xw..
0x000005F0 | BD | EF | BF | BD | EF | BF | BD | 00 | 0E | 41 | 64 | 6F | 62 | 65 | 00 | 64 | .........Adobe.d

[AkeneoUser]

--Ifb6p4_c_8njexJDDLKN7Waes5crz2-lNMB
Content-Disposition: form-data; name="product"

{"identifier":"MY12200", "attribute":"display_product_image", "scope":null,"locale":null}
--Ifb6p4_c_8njexJDDLKN7Waes5crz2-lNMB
Content-Disposition: form-data; name="file"; filename="4812126_MYS_800x800.jpg"
Content-Type: application/octet-stream