API Webservice upload product image error 66

[FloppyDisk]

Hello! 

I need your help. I am trying to upload an image via the REST API. I am searching the internet for a solution but every forum entry with this topic has no answer. 

Can anyone tell me how the xml structure should look like for uploading an image with base64 encoding? 

like: 

<prestashop>

<image>

<content encode="base64">here the base64 string</content>

</image>

</prestashop>

 

the reply is always the error 66 and "cannot save image". On the ftp the file permissions are set to 727.

I am glad for any kind of help!!!

thanks in advance

[FloppyDisk]

Add: And maybe the headers? I've set Content-type to multipart/form-data and Mime type (depending if jpg or png) to data:image/png